false hair vs postiche

false hair and postiche both are nouns.

Word	Noun	Adjective	Verb	Adverb
false hair	Yes	No	No	No
postiche	Yes	No	No	No

As nouns, false hair and postiche are synonyms defined as:

false hair and postiche: a covering or bunch of human or artificial hair used for disguise or adornment

Other synonyms of false hair include hairpiece.

false hair (noun)	postiche (noun)
a covering or bunch of human or artificial hair used for disguise or adornment	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