sand hopper vs beach flea

sand hopper and beach flea both are nouns.

Word	Noun	Adjective	Verb	Adverb
sand hopper	Yes	No	No	No
beach flea	Yes	No	No	No

As nouns, sand hopper and beach flea are synonyms defined as:

sand hopper and beach flea: small amphipod crustaceans that hop like fleas; common on ocean beaches

Other synonyms of sand hopper include sand flea, sandhopper.

sand hopper (noun)	beach flea (noun)
small amphipod crustaceans that hop like fleas; common on ocean beaches	small amphipod crustaceans that hop like fleas; common on ocean beaches