impression vs effect

impression and effect both are nouns.

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

As nouns, impression and effect are synonyms defined as:

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

Other hyponyms of impression include presence, first blush, hunch, intuition, suspicion.

impression (noun)	effect (noun)
an impressionistic portrayal of a person	an outward appearance
the act of pressing one thing on or into the surface of another	(of a law) having legal validity
(dentistry) an imprint of the teeth and gums in wax or plaster	an impression (especially one that is artificial or contrived)
an outward appearance	the central meaning or theme of a speech or literary work
a vague idea in which some confidence is placed	a phenomenon that follows and is caused by some previous phenomenon
a clear and telling mental image	a symptom caused by an illness or a drug
a symbol that is the result of printing or engraving
all the copies of a work printed at one time
a concavity in a surface produced by pressing

impression (verb)	effect (verb)
	produce
	act so as to bring into existence