How about cremains?
I did a forum search and didn't see any threads on it.

Mirriam Webster says the first known use was in 1947 - see link below.
http://www.merriam-webster.com/dictionary/cremains

I am also getting a ton of search results for it through google.

Our goal is to write at least one limerick for each meaning of each and every word in the English language. Our best limericks will clearly define their words in a humorous or interesting way, although some may provide more entertainment than definition, or vice versa.

As an international writing project, our limericks often use local spellings, grammar, punctuation, and rhymes that may not be familiar to all. Please keep in mind that what may at first look like an error is more likely to be an appropriate regionalism, correct according to the standards of the writer's homeland.

An example:
appellative by Steve Ngai (Limerick #67313)

If a mere common noun names you well
Or a term has specifics to tell
(Like Ivan the Relative),
We call them appellative,
Like naming in French: je m'appelle.

Link to site http://www.oedilf.com/db/Lim.php

As many many members are aware words fall in and out of dictionaries every year.
One website has set out to preserve the words who are currently endangered, and threatened by extinction.
Visit http://www.savethewords.org/, sign up and adopt a word before it is gone forever.

You can click on any of the words to see the definition and maybe pick it up and use it in your everyday life.

I have just adopted 'squiriferous' a fabulously sounding word that tickles my funny bone and should be easy to incorporate into my lexicon.

I would love to hear from anyone else who is squiriferous enough to join the cause, and especially to see what words they choose.

My suggested word is unicode.
I have searched here and not found any threads on this word.
Ninjawords defines unicode as:

Unicode
    noun
    °(computing) A series of character encoding standards intended to support the characters used by a large number of the world’s languages.
    °(computing) The Unicode standards together with standards for representing character strings as byte strings.

The free dictionary defines it as:

Unicode  (yn-kd)
A computer standard for encoding characters. Each character is represented by sixteen bits. Whereas ASCII, being an 8-bit encoding scheme, can only represent 256 characters, Unicode has 65,536 combinations, enabling it to encode the letters of all written languages as well as thousands of characters in languages such as Japanese and Chinese.

Perhaps not a common word, but one that many computer users are at least familiar with. To the best of my knowledge, it is not typically written with a capital letter at the start, though I could be mistaken.

I just received this email and I thought that you guys might enjoy this, though many have probably seen it before.
No idea on the veracity of the sources for these words.

BEWARE -- SOME ADULT CONCEPTS AND LANGUAGE

Once again, The Washington Post has published the winning submissions to its yearly neologism contest, in which readers are asked to supply alternative meanings for common words.

The winners are:


1. *Coffee* (n.), the person upon whom one coughs.


2. *Flabbergasted* (adj.), appalled over how much weight you have gained.


3. *Abdicate* (v.), to give up all hope of ever having a flat stomach.


4. *Esplanade* (v.), to attempt an explanation while drunk.


5. *Willy-nilly* (adj.), impotent.


6. *Negligent* (adj.), describes a condition in which you absent-mindedly answer the door in your nightgown.


7. *Lymph* (v.), to walk with a lisp.


8. *Gargoyle* (n), olive-flavoured mouthwash.


9. *Flatulence* (n.) emergency vehicle that picks you up after you are
run over by a steamroller.


10. *Balderdash* (n.), a rapidly receding hairline.


11. *Testicle* (n.), a humorous question on an exam.


12. *Rectitude* (n.), the formal, dignified bearing adopted by
proctologists.


13. *Pokemon* (n), a Rastafarian proctologist.


14. *Oyster* (n.), a person who sprinkles his conversation with Yiddishisms.


15. *Frisbeetarianism* (n.), (back by popular demand): The belief that,
when you die, your soul flies up onto the roof and gets stuck there.


16. *Circumvent* (n.), an opening in the front of boxer shorts worn by
Jewish men.


***********************************************************

The Washington Post's Style Invitational also asked readers to take any
word from the dictionary, alter it by adding, subtracting, or changing
one letter, and supply a new definition.

The winners are:



1. *Bozone* (n.): The substance surrounding stupid people that
stops bright ideas from penetrating. The bozone layer,
unfortunately, shows little sign of breaking down in the near future.


2. *Foreploy* (v): Any misrepresentation about yourself for the
purpose of getting laid.


3. *Cashtration* (n.): The act of buying a house, which renders
the subject financially impotent for an indefinite period.


4. *Giraffiti* (n): Vandalism spray-painted very, very high.


5. *Sarchasm* (n): The gulf between the author of sarcastic wit
and the person who doesn't get it.


6. *Inoculatte* (v): To take coffee intravenously when you are
running late.


7. *Hipatitis* (n): Terminal coolness.


8. *Osteopornosis* (n): A degenerate disease. (This one got
extra credit.)


9. *Karmageddon* (n): its like, when everybody is sending off
all these really bad vibes, right? And then, like, the Earth
explodes and it's like, a serious bummer.


10. *Decafalon* (n.): The grueling event of getting through the
day consuming only things that are good for you.


11. *Glibido* (v): All talk and no action.


12. *Dopeler effect* (n): The tendency of stupid ideas to seem
smarter when they come at you rapidly.


13. *Arachnoleptic fit *(n.): The frantic dance performed just
after you've accidentally walked through a spider web.


14. *Beelzebug* (n.): Satan in the form of a mosquito that gets
into your bedroom at three in the morning and cannot be cast out.


15. *Caterpallor* (n.): The color you turn after finding half a
grub in the fruit you're eating.


And the pick of the lot………….


16. *Ignoranus* (n): A person who's both stupid and an a**hole.

How about larp? (Live Action Role Play). It is an abbreviation that is pronounced as a word, so I think it would fit within the word rules.
As a role player, this is a pretty common word for me, though I have never actually been involved in any LARP games. I am not sure of it's widespread usage, but I think it should suit as a rare word at least.
Wiki link http://en.wikipedia.org/wiki/Live_action_role-playing_game

This site typically has an array of slang words included - particularly Aussie slang, so I would love to see oldies included in the word list.
This is the way every Aussie I know refers to their elders - in particular their parents.
It also works as a musical reference to golden oldies.
Cheers