sponge mushroom vs sponge morel

sponge mushroom and sponge morel both are nouns.

Word	Noun	Adjective	Verb	Adverb
sponge mushroom	Yes	No	No	No
sponge morel	Yes	No	No	No

As nouns, sponge mushroom and sponge morel are synonyms defined as:

sponge mushroom and sponge morel: an edible and choice morel with a globular to elongate head with an irregular pattern of pits and ridges

Other synonyms of sponge mushroom include common morel, Morchella esculenta.

sponge mushroom (noun)	sponge morel (noun)
an edible and choice morel with a globular to elongate head with an irregular pattern of pits and ridges	an edible and choice morel with a globular to elongate head with an irregular pattern of pits and ridges