gatherer vs gleaner

gatherer and gleaner both are nouns.

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

As nouns, gleaner is a hyponym of gatherer; that is, gleaner is a word with a more specific, narrower meaning than gatherer:

gatherer: a person who is employed to collect payments (as for rent or taxes)
gleaner: someone who gathers something in small pieces (e.g. information) slowly and carefully

Other hyponyms of gatherer include conductor, rent collector.

gatherer (noun)	gleaner (noun)
a person who is employed to collect payments (as for rent or taxes)	someone who picks up grain left in the field by the harvesters
a person who gathers	someone who gathers something in small pieces (e.g. information) slowly and carefully