Ah, I see. If A does get a black hat, then, since nobody else can determine the color of theirs, nobody else leaves. A detects that nobody is leaving, and thus leaves knowing he has a black hat, and the other two are fired. Only if A has a white hat will others be able to leave the room.

I was so close, but didn't realize it at first.

The spelling of each word is somewhat representative of what the word represents. For instance, curt is a very short word, while sesquipedalian is a very long word. English is written in English and ostentatious sounds ostentatious.

I have a few more words to submit:

word (is a word)
noun (is a noun)
descriptive (is a descriptor)
writing (is writing)
written (is written)
wee (is small)
text (is text)
legible (is legible)