Balanus balanoides vs acorn barnacle

Balanus balanoides and acorn barnacle both are nouns.

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

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

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

Other synonyms of Balanus balanoides include rock barnacle.

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