extrapolate vs deduct

extrapolate and deduct both are verbs.

Word	Noun	Adjective	Verb	Adverb
extrapolate	No	No	Yes	No
deduct	No	No	Yes	No

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

extrapolate: gain knowledge of (an area not known or experienced) by extrapolating
deduct: reason by deduction; establish by deduction

Other hypernyms of extrapolate include deduce, derive, infer.

extrapolate (verb)	deduct (verb)
estimate the value of something based on known values	reason by deduction; establish by deduction
gain knowledge of (an area not known or experienced) by extrapolating	make a subtraction
draw from specific cases for more general cases	retain and refrain from disbursing; of payments