insertion vs interpolation

insertion and interpolation both are nouns.

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

As nouns, insertion and interpolation are synonyms defined as:

insertion and interpolation: a message (spoken or written) that is introduced or inserted

insertion (noun)	interpolation (noun)
the act of putting one thing into another	the action of interjecting or interposing an action or remark that interrupts
a message (spoken or written) that is introduced or inserted	(mathematics) calculation of the value of a function between the values already known
	a message (spoken or written) that is introduced or inserted