alibi vs self-justification

alibi and self-justification both are nouns.

Word	Noun	Adjective	Verb	Adverb
alibi	Yes	No	Yes	No
self-justification	Yes	No	No	No

As nouns, alibi and self-justification are synonyms defined as:

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

Other synonyms of alibi include exculpation, excuse.

alibi (noun)	self-justification (noun)
(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.

alibi (verb)	self-justification (verb)
exonerate by means of an alibi