giardia vs flagellate protozoan

giardia and flagellate protozoan both are nouns.

Word	Noun	Adjective	Verb	Adverb
giardia	Yes	No	No	No
flagellate protozoan	Yes	No	No	No

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

giardia: a suspected cause of diarrhea in humans
flagellate protozoan: a usually nonphotosynthetic free-living protozoan with whiplike appendages; some are pathogens of humans and other animals

Other hypernyms of giardia include flagellate, flagellated protozoan, mastigophoran, mastigophore.

giardia (noun)	flagellate protozoan (noun)
a suspected cause of diarrhea in humans	a usually nonphotosynthetic free-living protozoan with whiplike appendages; some are pathogens of humans and other animals