contact vs impact

contact and impact both are nouns.

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

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

Other hyponyms of contact include collision, hit, engagement, interlocking, mesh, meshing, flick, touch, touching.

contact (noun)	impact (noun)
the act of touching physically	influencing strongly
close interaction	the violent interaction of individuals or groups entering into combat
(electronics) a junction where things (as two electrical conductors) touch or are in physical contact	the striking of one body against another
a thin curved glass or plastic lens designed to fit over the cornea in order to correct vision or to deliver medication	a forceful consequence; a strong effect
a channel for communication between groups
a communicative interaction
the physical coming together of two or more things
a person who is in a position to give you special assistance
the state or condition of touching or of being in immediate proximity

contact (verb)	impact (verb)
be in or establish communication with	have an effect upon
be in direct physical contact with; make contact	press or wedge together; pack together