manure vs green manure

manure and green manure both are nouns.

Word	Noun	Adjective	Verb	Adverb
manure	Yes	No	Yes	No
green manure	Yes	No	No	No

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

manure: any animal or plant material used to fertilize land especially animal excreta usually with litter material
green manure: a growing crop that is plowed under to enrich soil

Other hyponyms of manure include chicken manure, cow manure, horse manure, night soil.

manure (noun)	green manure (noun)
any animal or plant material used to fertilize land especially animal excreta usually with litter material	a growing crop that is plowed under to enrich soil

manure (verb)	green manure (verb)
spread manure, as for fertilization