carry back vs deduct

carry back and deduct both are verbs.

Word	Noun	Adjective	Verb	Adverb
carry back	No	No	Yes	No
deduct	No	No	Yes	No

As verbs, deduct is a hypernym of carry back; that is, deduct is a word with a broader meaning than carry back:

carry back: deduct a loss or an unused credit from taxable income for a prior period
deduct: make a subtraction

Other hypernyms of carry back include subtract, take off.

carry back (verb)	deduct (verb)
deduct a loss or an unused credit from taxable income for a prior period	reason by deduction; establish by deduction
	make a subtraction
	retain and refrain from disbursing; of payments