influence vs impact

influence and impact both are nouns.

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

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

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

Other hypernyms of influence include affect, bear on, bear upon, touch, touch on.

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

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