impact vs wallop

impact and wallop both are nouns.

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

As nouns, impact and wallop are synonyms defined as:

impact (noun)	wallop (noun)
influencing strongly	a severe blow
the violent interaction of individuals or groups entering into combat	a forceful consequence; a strong effect
the striking of one body against another
a forceful consequence; a strong effect

impact (verb)	wallop (verb)
have an effect upon	defeat soundly and utterly
press or wedge together; pack together	strike hard