alibi vs excuse

alibi and excuse both are nouns.

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

As nouns, alibi and excuse are synonyms defined as:

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

Other synonyms of alibi include exculpation, self-justification.

As verbs, excuse is a hypernym of alibi; that is, excuse is a word with a broader meaning than alibi:

Other hypernyms of alibi include explain.

alibi (noun)	excuse (noun)
(law) a defense by an accused person purporting to show that he or she could not have committed the crime in question	a poor example
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.
	a note explaining an absence

alibi (verb)	excuse (verb)
exonerate by means of an alibi	accept an excuse for
	defend, explain, clear away, or make excuses for by reasoning
	excuse, overlook, or make allowances for; be lenient with
	serve as a reason or cause or justification of
	grant exemption or release to
	ask for permission to be released from an engagement