toupee vs postiche

toupee and postiche both are nouns.

Word	Noun	Adjective	Verb	Adverb
toupee	Yes	No	No	No
postiche	Yes	No	No	No

As nouns, postiche is a hypernym of toupee; that is, postiche is a word with a broader meaning than toupee:

toupee: a small hairpiece to cover partial baldness
postiche: a covering or bunch of human or artificial hair used for disguise or adornment

Other hypernyms of toupee include false hair, hairpiece.

toupee (noun)	postiche (noun)
a small hairpiece to cover partial baldness	something that is a counterfeit; not what it seems to be
	a covering or bunch of human or artificial hair used for disguise or adornment