default vs defaulter

default and defaulter both are nouns.

Word	Noun	Adjective	Verb	Adverb
default	Yes	No	Yes	No
defaulter	Yes	No	No	No

default (noun)	defaulter (noun)
loss due to not showing up	a contestant who forfeits a match
an option that is selected automatically unless an alternative is specified	someone who fails to meet a financial obligation
loss resulting from failure of a debt to be paid	someone who fails to make a required appearance in court
act of failing to meet a financial obligation

default (verb)	defaulter (verb)
fail to pay up