sandhopper vs sand hopper

sandhopper and sand hopper both are nouns.

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

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

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

Other synonyms of sandhopper include beach flea, sand flea.

sandhopper (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