earth-ball vs truffle

earth-ball and truffle both are nouns.

Word	Noun	Adjective	Verb	Adverb
earth-ball	Yes	No	No	No
truffle	Yes	No	No	No

As nouns, earth-ball and truffle are synonyms defined as:

earth-ball and truffle: any of various highly prized edible subterranean fungi of the genus Tuber; grow naturally in southwestern Europe

Other synonyms of earth-ball include earthnut.

earth-ball (noun)	truffle (noun)
any of various highly prized edible subterranean fungi of the genus Tuber; grow naturally in southwestern Europe	edible subterranean fungus of the genus Tuber
	creamy chocolate candy
	any of various highly prized edible subterranean fungi of the genus Tuber; grow naturally in southwestern Europe