Arachis vs peanut

Arachis and peanut both are nouns.

Word	Noun	Adjective	Verb	Adverb
Arachis	Yes	No	No	No
peanut	Yes	Yes	No	No

Arachis (noun)	peanut (noun)
a genus of plants with pods that ripen underground (see peanut)	pod of the peanut vine containing usually 2 nuts or seeds; `groundnut' and `monkey nut' are British terms
	a young child who is small for his age
	widely cultivated American plant cultivated in tropical and warm regions; showy yellow flowers on stalks that bend over to the soil so that seed pods ripen underground
	underground pod of the peanut vine

Arachis (adjective)	peanut (adjective)
	of little importance or influence or power; of minor status