sustain vs sustainer

sustain is not a noun while sustainer is a noun.

Word	Noun	Adjective	Verb	Adverb
sustain	No	No	Yes	No
sustainer	Yes	No	No	No

sustain (noun)	sustainer (noun)
	someone who upholds or maintains

sustain (verb)	sustainer (verb)
undergo (as of injuries and illnesses)
establish or strengthen as with new evidence or facts
admit as valid
supply with necessities and support
provide with nourishment
be the physical support of; carry the weight of
lengthen or extend in duration or space