try on vs don

try on is not a noun while don is a noun.

Word	Noun	Adjective	Verb	Adverb
try on	No	No	Yes	No
don	Yes	No	Yes	No

As verbs, don is a hypernym of try on; that is, don is a word with a broader meaning than try on:

Other hypernyms of try on include assume, get into, put on, wear.

try on (noun)	don (noun)
	teacher at a university or college (especially at Cambridge or Oxford)
	the head of an organized crime family

try on (verb)	don (verb)
put on a garment in order to see whether it fits and looks nice	put clothing on one's body