impression vs image

impression and image both are nouns.

Word	Noun	Adjective	Verb	Adverb
impression	Yes	No	No	No
image	Yes	No	Yes	No

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

impression: an outward appearance
image: the general impression that something (a person or organization or product) presents to the public

Other hyponyms of impression include figure, mark, tout ensemble.

As nouns, image is a hypernym of impression; that is, image is a word with a broader meaning than impression:

Other hypernyms of impression include mental image.

impression (noun)	image (noun)
an impressionistic portrayal of a person	a visual representation (of an object or scene or person or abstraction) produced on a surface
the act of pressing one thing on or into the surface of another	a representation of a person (especially in the form of sculpture)
(dentistry) an imprint of the teeth and gums in wax or plaster	(Jungian psychology) a personal facade that one presents to the world
an outward appearance	the general impression that something (a person or organization or product) presents to the public
a vague idea in which some confidence is placed	an iconic mental representation
a clear and telling mental image	a standard or typical example
a symbol that is the result of printing or engraving	language used in a figurative or nonliteral sense
all the copies of a work printed at one time	(mathematics) the set of values of the dependent variable for which a function is defined
a concavity in a surface produced by pressing	someone who closely resembles a famous person (especially an actor)

impression (verb)	image (verb)
	imagine; conceive of; see in one's mind
	render visible, as by means of MRI