black rockweed vs Fucus vesiculosus

black rockweed and Fucus vesiculosus both are nouns.

Word	Noun	Adjective	Verb	Adverb
black rockweed	Yes	No	No	No
Fucus vesiculosus	Yes	No	No	No

As nouns, black rockweed and Fucus vesiculosus are synonyms defined as:

black rockweed and Fucus vesiculosus: a common rockweed used in preparing kelp and as manure

Other synonyms of black rockweed include bladder fucus, bladderwrack, tang.

black rockweed (noun)	Fucus vesiculosus (noun)
a common rockweed used in preparing kelp and as manure	a common rockweed used in preparing kelp and as manure