imitation vs faux

imitation is a noun but faux is not a noun.

Word	Noun	Adjective	Verb	Adverb
imitation	Yes	Yes	No	No
faux	No	Yes	No	No

As adjectives, imitation and faux are synonyms defined as:

imitation and faux: not genuine or real; being an imitation of the genuine article

Other synonyms of imitation include fake, false, simulated.

imitation (noun)	faux (noun)
copying (or trying to copy) the actions of someone else
something copied or derived from an original
the doctrine that representations of nature or human behavior should be accurate imitations
a representation of a person that is exaggerated for comic effect

imitation (adjective)	faux (adjective)
not genuine or real; being an imitation of the genuine article	not genuine or real; being an imitation of the genuine article