exculpation vs alibi

exculpation and alibi both are nouns.

Word	Noun	Adjective	Verb	Adverb
exculpation	Yes	No	No	No
alibi	Yes	No	Yes	No

As nouns, exculpation and alibi are synonyms defined as:

exculpation and alibi: a defense of some offensive behavior or some failure to keep a promise etc.

Other synonyms of exculpation include excuse, self-justification.

exculpation (noun)	alibi (noun)
the act of freeing from guilt or blame	(law) a defense by an accused person purporting to show that he or she could not have committed the crime in question
a defense of some offensive behavior or some failure to keep a promise etc.	a defense of some offensive behavior or some failure to keep a promise etc.

exculpation (verb)	alibi (verb)
	exonerate by means of an alibi