aftermath vs consequence

aftermath and consequence both are nouns.

Word	Noun	Adjective	Verb	Adverb
aftermath	Yes	No	No	No
consequence	Yes	No	No	No

As nouns, aftermath and consequence are synonyms defined as:

aftermath and consequence: the outcome of an event especially as relative to an individual

As nouns, consequence is a hypernym of aftermath; that is, consequence is a word with a broader meaning than aftermath:

aftermath: the consequences of an event (especially a catastrophic event)
consequence: a phenomenon that follows and is caused by some previous phenomenon

Other hypernyms of aftermath include effect, event, issue, outcome, result, upshot.

aftermath (noun)	consequence (noun)
the outcome of an event especially as relative to an individual	having important effects or influence
the consequences of an event (especially a catastrophic event)	the outcome of an event especially as relative to an individual
	a phenomenon that follows and is caused by some previous phenomenon