euglena vs protozoan

euglena and protozoan both are nouns.

Word	Noun	Adjective	Verb	Adverb
euglena	Yes	No	No	No
protozoan	Yes	Yes	No	No

As nouns, protozoan is a hypernym of euglena; that is, protozoan is a word with a broader meaning than euglena:

euglena: minute single-celled green freshwater organism having a single flagella; often classed as algae
protozoan: any of diverse minute acellular or unicellular organisms usually nonphotosynthetic

Other hypernyms of euglena include protozoon.

euglena (noun)	protozoan (noun)
minute single-celled green freshwater organism having a single flagella; often classed as algae	any of diverse minute acellular or unicellular organisms usually nonphotosynthetic

euglena (adjective)	protozoan (adjective)
	of or relating to the Protozoa