fucoid algae vs fucoid

fucoid algae and fucoid both are nouns.

Word	Noun	Adjective	Verb	Adverb
fucoid algae	Yes	No	No	No
fucoid	Yes	No	No	No

As nouns, fucoid algae and fucoid are synonyms defined as:

fucoid algae (noun)	fucoid (noun)
any of various algae of the family Fucaceae	any of various algae of the family Fucaceae
	a fossilized cast or impression of algae of the order Fucales