star earthball vs earthball

star earthball and earthball both are nouns.

Word	Noun	Adjective	Verb	Adverb
star earthball	Yes	No	No	No
earthball	Yes	No	No	No

As nouns, earthball is a hypernym of star earthball; that is, earthball is a word with a broader meaning than star earthball:

star earthball: an earthball with a smooth upper surface that is at first buried in sand; the top of the fruiting body opens up to form segments like the ray of an umbel
earthball: any of various fungi of the genus Scleroderma having hard-skinned subterranean fruiting bodies resembling truffles

Other hypernyms of star earthball include false truffle, hard-skinned puffball, puffball.

star earthball (noun)	earthball (noun)
an earthball with a smooth upper surface that is at first buried in sand; the top of the fruiting body opens up to form segments like the ray of an umbel	any of various fungi of the genus Scleroderma having hard-skinned subterranean fruiting bodies resembling truffles