trooper vs cavalry

trooper and cavalry both are nouns.

Word	Noun	Adjective	Verb	Adverb
trooper	Yes	No	No	No
cavalry	Yes	No	No	No

trooper (noun)	cavalry (noun)
a mounted police officer	a highly mobile army unit
a soldier in a motorized army unit	troops trained to fight on horseback
a state police officer
a soldier mounted on horseback