I have to say I'm a bit dubious about "ills", 3-B.
It is the plural of the noun "ill" which dictionaries define as meaning misfortune, trouble, harm, ailment. The singular is used in the phrase "I wish you no ill", or you might say, "Sometimes good can come from ill", although the word certainly is more commonly used in the plural.
I'll have to mull it over some more...
In the meantime, a word you can use when the letters are there is "illth". (You probably already know it, 3-B, but maybe some others don't.) As you can imagine, it means the opposite of health, but it can also mean the opposite of wealth. This usage possibly comes from John Ruskin, who used the word to describe products that do not add to people's well-being.