image vs impression

image and impression both are nouns.

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

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

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

Other hypernyms of image include effect.

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

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

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