mussel shrimp vs seed shrimp

mussel shrimp and seed shrimp both are nouns.

Word	Noun	Adjective	Verb	Adverb
mussel shrimp	Yes	No	No	No
seed shrimp	Yes	No	No	No

As nouns, mussel shrimp and seed shrimp are synonyms defined as:

mussel shrimp and seed shrimp: tiny marine and freshwater crustaceans with a shrimp-like body enclosed in a bivalve shell

Other synonyms of mussel shrimp include ostracod.

mussel shrimp (noun)	seed shrimp (noun)
tiny marine and freshwater crustaceans with a shrimp-like body enclosed in a bivalve shell	tiny marine and freshwater crustaceans with a shrimp-like body enclosed in a bivalve shell