logical system vs extrapolate

logical system is a noun but extrapolate is not a noun.

Word	Noun	Adjective	Verb	Adverb
logical system	Yes	No	No	No
extrapolate	No	No	Yes	No

logical system (noun)	extrapolate (noun)
a system of reasoning

logical system (verb)	extrapolate (verb)
	estimate the value of something based on known values
	gain knowledge of (an area not known or experienced) by extrapolating
	draw from specific cases for more general cases