act vs impersonate

act is a noun but impersonate is not a noun.

Word	Noun	Adjective	Verb	Adverb
act	Yes	No	Yes	No
impersonate	No	No	Yes	No

As verbs, impersonate is a hyponym of act; that is, impersonate is a word with a more specific, narrower meaning than act:

Other hyponyms of act include make, make believe, pretend, support, act out, enact, reenact, act out, portray, parody, emote.

act (noun)	impersonate (noun)
something that people do or cause to happen
a subdivision of a play or opera or ballet
a legal document codifying the result of deliberations of a committee or society or legislative body
a short performance that is part of a longer program
a manifestation of insincerity

act (verb)	impersonate (verb)
behave in a certain manner; show a certain behavior; conduct or comport oneself	pretend to be someone you are not; sometimes with fraudulent intentions
pretend to have certain qualities or state of mind	represent another person with comic intentions
discharge one's duties	assume or act the character of
play a role or part
perform on a stage or theater
behave unnaturally or affectedly
perform an action, or work out or perform (an action)
have an effect or outcome; often the one desired or expected
be suitable for theatrical performance