rock barnacle vs Balanus balanoides

rock barnacle and Balanus balanoides both are nouns.

Word	Noun	Adjective	Verb	Adverb
rock barnacle	Yes	No	No	No
Balanus balanoides	Yes	No	No	No

As nouns, rock barnacle and Balanus balanoides are synonyms defined as:

rock barnacle and Balanus balanoides: barnacle that attaches to rocks especially in intertidal zones

Other synonyms of rock barnacle include acorn barnacle.

rock barnacle (noun)	Balanus balanoides (noun)
barnacle that attaches to rocks especially in intertidal zones	barnacle that attaches to rocks especially in intertidal zones