flagellum vs true bacteria

flagellum and true bacteria both are nouns.

Word	Noun	Adjective	Verb	Adverb
flagellum	Yes	No	No	No
true bacteria	Yes	No	No	No

flagellum (noun)	true bacteria (noun)
a lash-like appendage used for locomotion (e.g., in sperm cells and some bacteria and protozoa)	a large group of bacteria having rigid cell walls; motile types have flagella
a whip used to inflict punishment