I was a teeny bit skeptical about these two, but it seems they are both legit. I should have had more faith in you, non-a.
Sluicer can be found in the Shorter Oxford Dictionary, as a run-on entry under
sluice, with two meanings:
(a) US, Austral. & NZ a gold-miner who uses a sluice; (b) a person in charge of a sluice on a waterway
The miner meaning is also in the New Zealand Oxford and the Australian Oxford. The Australian National Dictionary also lists the word, with several citations, the earliest from 1855.
Rusticle is a more recent word, having been coined in the 1980s by underwater archeology specialist Robert Ballard, as a term for formations he observed on the Titanic. The word is a portmanteau of
rust and
icicle. The online Oxford gives this definition:
An elongated structure often found on underwater shipwrecks, somewhat like a stalactite or icicle in appearance, consisting of microbial and fungal growths inside a layer of iron oxide.
Both suggestions will be added as rare words.
