troops vs cavalry

troops and cavalry both are nouns.

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

As nouns, cavalry is a hyponym of troops; that is, cavalry is a word with a more specific, narrower meaning than troops:

Other hyponyms of troops include friendly, hostile, horse, horse cavalry, garrison.

troops (noun)	cavalry (noun)
soldiers collectively	a highly mobile army unit
	troops trained to fight on horseback