groundnut vs monkey nut

groundnut and monkey nut both are nouns.

Word	Noun	Adjective	Verb	Adverb
groundnut	Yes	No	No	No
monkey nut	Yes	No	No	No

As nouns, groundnut and monkey nut are synonyms defined as:

groundnut and monkey nut: pod of the peanut vine containing usually 2 nuts or seeds; `groundnut' and `monkey nut' are British terms

Other synonyms of groundnut include earthnut, goober, goober pea, peanut.

groundnut (noun)	monkey nut (noun)
nutlike tuber; important food of Native Americans	pod of the peanut vine containing usually 2 nuts or seeds; `groundnut' and `monkey nut' are British terms
pod of the peanut vine containing usually 2 nuts or seeds; `groundnut' and `monkey nut' are British terms
a North American vine with fragrant blossoms and edible tubers; important food crop of Native Americans