fodder vs forage

fodder and forage both are nouns.

Word	Noun	Adjective	Verb	Adverb
fodder	Yes	No	Yes	No
forage	Yes	No	Yes	No

As nouns, forage is a hyponym of fodder; that is, forage 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
forage: bulky food like grass or hay for browsing or grazing horses or cattle

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

fodder (noun)	forage (noun)
coarse food (especially for livestock) composed of entire plants or the leaves and stalks of a cereal crop	the act of searching for food and provisions
soldiers who are regarded as expendable in the face of artillery fire	bulky food like grass or hay for browsing or grazing horses or cattle

fodder (verb)	forage (verb)
give fodder (to domesticated animals)	wander and feed
	collect or look around for (food)