interpolation vs interpolate

interpolation is a noun but interpolate is not a noun.

Word	Noun	Adjective	Verb	Adverb
interpolation	Yes	No	No	No
interpolate	No	No	Yes	No

interpolation (noun)	interpolate (noun)
the action of interjecting or interposing an action or remark that interrupts
(mathematics) calculation of the value of a function between the values already known
a message (spoken or written) that is introduced or inserted

interpolation (verb)	interpolate (verb)
	insert words into texts, often falsifying it thereby
	estimate the value of something based on known values