giant puffball vs true puffball

giant puffball and true puffball both are nouns.

Word	Noun	Adjective	Verb	Adverb
giant puffball	Yes	No	No	No
true puffball	Yes	No	No	No

As nouns, true puffball is a hypernym of giant puffball; that is, true puffball is a word with a broader meaning than giant puffball:

giant puffball: huge edible puffball up to 2 feet diameter and 25 pounds in weight
true puffball: any of various fungi of the family Lycoperdaceae whose round fruiting body discharges a cloud of spores when mature

Other hypernyms of giant puffball include puffball.

giant puffball (noun)	true puffball (noun)
huge edible puffball up to 2 feet diameter and 25 pounds in weight	any of various fungi of the family Lycoperdaceae whose round fruiting body discharges a cloud of spores when mature