impose vs dictate

impose is not a noun while dictate is a noun.

Word	Noun	Adjective	Verb	Adverb
impose	No	No	Yes	No
dictate	Yes	No	Yes	No

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

Other hyponyms of impose include order, prescribe, intrude, obtrude, clamp, give, foist.

impose (noun)	dictate (noun)
	a guiding principle
	an authoritative rule

impose (verb)	dictate (verb)
impose something unpleasant	say out loud for the purpose of recording
impose and collect	issue commands or orders for
compel to behave in a certain way	rule as a dictator