euglenid vs algae

euglenid and algae both are nouns.

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

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

euglenid: marine and freshwater green or colorless flagellate organism
algae: primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves

Other hypernyms of euglenid include alga.

euglenid (noun)	algae (noun)
marine and freshwater green or colorless flagellate organism	primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves