linger vs lingerer

linger is not a noun while lingerer is a noun.

Word	Noun	Adjective	Verb	Adverb
linger	No	No	Yes	No
lingerer	Yes	No	No	No

linger (noun)	lingerer (noun)
	someone who lingers aimlessly in or about a place

linger (verb)	lingerer (verb)
take one's time; proceed slowly
leave slowly and hesitantly
be about a place without any apparent purpose
to hang about in a place beyond the proper or usual time
remain present although waning or gradually dying