excuse vs excuser

excuse and excuser both are nouns.

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

excuse (noun)	excuser (noun)
a poor example	a person who pardons or forgives or excuses a fault or offense
a defense of some offensive behavior or some failure to keep a promise etc.
a note explaining an absence

excuse (verb)	excuser (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