postiche vs toupe

postiche and toupe both are nouns.

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

As nouns, toupe is a hyponym of postiche; that is, toupe is a word with a more specific, narrower meaning than postiche:

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

Other hyponyms of postiche include Afro-wig, switch, toupee, wig.

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