green bean vs mung bean

green bean and mung bean both are nouns.

Word	Noun	Adjective	Verb	Adverb
green bean	Yes	No	No	No
mung bean	Yes	No	No	No

As nouns, green bean and mung bean are synonyms defined as:

Other synonyms of green bean include golden gram, green gram, green soy, mash bean, monggo, moong, mung, munggo.

As nouns, green bean and mung bean are synonyms defined as:

Other synonyms of green bean include golden gram, green gram, green soy, mash bean, monggo, moong, mung, munggo.

green bean (noun)	mung bean (noun)
immature bean pod eaten as a vegetable	seed of the mung bean plant used for food; food from the seed of the mung bean plant
seed of the mung bean plant used for food; food from the seed of the mung bean plant	erect bushy annual widely cultivated in warm regions of India and Indonesia and United States for forage and especially its edible seeds; chief source of bean sprouts used in Chinese cookery; sometimes placed in genus Phaseolus
a common bean plant cultivated for its slender green edible pods	seed of the mung bean plant; used for food; seed of the mung bean plant
seed of the mung bean plant; used for food; seed of the mung bean plant