euglenoid vs alga

euglenoid and alga both are nouns.

Word	Noun	Adjective	Verb	Adverb
euglenoid	Yes	No	No	No
alga	Yes	No	No	No

As nouns, alga is a hypernym of euglenoid; that is, alga is a word with a broader meaning than euglenoid:

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

Other hypernyms of euglenoid include algae.

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