Helvella acetabulum vs helvella

Helvella acetabulum and helvella both are nouns.

Word	Noun	Adjective	Verb	Adverb
Helvella acetabulum	Yes	No	No	No
helvella	Yes	No	No	No

As nouns, helvella is a hypernym of Helvella acetabulum; that is, helvella is a word with a broader meaning than Helvella acetabulum:

Helvella acetabulum: a helvella with a cup-shaped fertile body having a brown interior; the stalk is creamy white and heavily ribbed
helvella: any fungus of the genus Helvella having the ascocarps stalked or pleated or often in folds

Helvella acetabulum (noun)	helvella (noun)
a helvella with a cup-shaped fertile body having a brown interior; the stalk is creamy white and heavily ribbed	any fungus of the genus Helvella having the ascocarps stalked or pleated or often in folds