dulse vs red algae

dulse and red algae both are nouns.

Word	Noun	Adjective	Verb	Adverb
dulse	Yes	No	No	No
red algae	Yes	No	No	No

As nouns, red algae is a hypernym of dulse; that is, red algae is a word with a broader meaning than dulse:

dulse: coarse edible red seaweed
red algae: marine algae in which the chlorophyll is masked by a red or purplish pigment; source of agar and carrageenan

dulse (noun)	red algae (noun)
coarse edible red seaweed	marine algae in which the chlorophyll is masked by a red or purplish pigment; source of agar and carrageenan