sand hopper vs sand flea

sand hopper and sand flea both are nouns.

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

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

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

Other synonyms of sand hopper include beach flea, sandhopper.

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