oil nut vs buffalo nut

oil nut and buffalo nut both are nouns.

Word	Noun	Adjective	Verb	Adverb
oil nut	Yes	No	No	No
buffalo nut	Yes	No	No	No

As nouns, oil nut and buffalo nut are synonyms defined as:

Other synonyms of oil nut include elk nut.

oil nut (noun)	buffalo nut (noun)
oily drupaceous fruit of rabbitwood	shrub of southeastern United States parasitic on roots of hemlocks having sparse spikes of greenish flowers and pulpy drupes
	oily drupaceous fruit of rabbitwood