true bacteria vs flagellum

true bacteria and flagellum both are nouns.

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

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