beach flea vs sand hopper

beach flea and sand hopper both are nouns.

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

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

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

Other synonyms of beach flea include sand flea, sandhopper.

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