fodder vs horse bean

fodder and horse bean both are nouns.

Word	Noun	Adjective	Verb	Adverb
fodder	Yes	No	Yes	No
horse bean	Yes	No	No	No

As nouns, horse bean is a hyponym of fodder; that is, horse bean is a word with a more specific, narrower meaning than fodder:

fodder: coarse food (especially for livestock) composed of entire plants or the leaves and stalks of a cereal crop
horse bean: a bean plant cultivated for use animal fodder

Other hyponyms of fodder include eatage, forage, grass, pasturage, pasture, alfalfa, broad bean, hay, stover.

fodder (noun)	horse bean (noun)
coarse food (especially for livestock) composed of entire plants or the leaves and stalks of a cereal crop	a bean plant cultivated for use animal fodder
soldiers who are regarded as expendable in the face of artillery fire

fodder (verb)	horse bean (verb)
give fodder (to domesticated animals)