impact vs influence

impact and influence both are nouns.

Word	Noun	Adjective	Verb	Adverb
impact	Yes	No	Yes	No
influence	Yes	No	Yes	No

As nouns, influence is a hypernym of impact; that is, influence is a word with a broader meaning than impact:

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

impact (noun)	influence (noun)
influencing strongly	causing something without any direct or apparent effort
the violent interaction of individuals or groups entering into combat	a power to affect persons or events especially power based on prestige etc
the striking of one body against another	a cognitive factor that tends to have an effect on what you do
a forceful consequence; a strong effect	one having power to influence another
	the effect of one thing (or person) on another

impact (verb)	influence (verb)
have an effect upon	shape or influence; give direction to
press or wedge together; pack together	induce into action by using one's charm
	have and exert influence or effect