excuse vs excusatory

excuse is a noun but excusatory is not a noun.

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

excuse (noun)	excusatory (noun)
a poor example
a defense of some offensive behavior or some failure to keep a promise etc.
a note explaining an absence

excuse (adjective)	excusatory (adjective)
	offering or expressing apology

excuse (verb)	excusatory (verb)
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