earthball vs hard-skinned puffball

earthball and hard-skinned puffball both are nouns.

Word	Noun	Adjective	Verb	Adverb
earthball	Yes	No	No	No
hard-skinned puffball	Yes	No	No	No

As nouns, earthball and hard-skinned puffball are synonyms defined as:

earthball and hard-skinned puffball: any of various fungi of the genus Scleroderma having hard-skinned subterranean fruiting bodies resembling truffles

Other synonyms of earthball include false truffle, puffball.

earthball (noun)	hard-skinned puffball (noun)
any of various fungi of the genus Scleroderma having hard-skinned subterranean fruiting bodies resembling truffles	any of various fungi of the genus Scleroderma having hard-skinned subterranean fruiting bodies resembling truffles