carragheen vs red algae

carragheen and red algae both are nouns.

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

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

carragheen: dark purple edible seaweed of the Atlantic coasts of Europe and North America
red algae: marine algae in which the chlorophyll is masked by a red or purplish pigment; source of agar and carrageenan

carragheen (noun)	red algae (noun)
dark purple edible seaweed of the Atlantic coasts of Europe and North America	marine algae in which the chlorophyll is masked by a red or purplish pigment; source of agar and carrageenan