glean vs gleaner

glean is not a noun while gleaner is a noun.

Word	Noun	Adjective	Verb	Adverb
glean	No	No	Yes	No
gleaner	Yes	No	No	No

glean (noun)	gleaner (noun)
	someone who picks up grain left in the field by the harvesters
	someone who gathers something in small pieces (e.g. information) slowly and carefully

glean (verb)	gleaner (verb)
gather, as of natural products