euglena vs protozoon

euglena and protozoon both are nouns.

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

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

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

Other hypernyms of euglena include protozoan.

euglena (noun)	protozoon (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