half-pay vs pay

half-pay and pay both are nouns.

Word	Noun	Adjective	Verb	Adverb
half-pay	Yes	No	No	No
pay	Yes	No	Yes	No

As nouns, pay is a hypernym of half-pay; that is, pay is a word with a broader meaning than half-pay:

Other hypernyms of half-pay include earnings, remuneration, salary, wage.

half-pay (noun)	pay (noun)
reduced wage paid to someone who is not working full time	something that remunerates

half-pay (verb)	pay (verb)
	dedicate
	bear (a cost or penalty), in recompense for some action
	convey, as of a compliment, regards, attention, etc.; bestow
	give money, usually in exchange for goods or services
	bring in
	do or give something to somebody in return
	cancel or discharge a debt
	make a compensation for
	discharge or settle
	render
	be worth it