interpolation vs insertion

interpolation and insertion both are nouns.

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

As nouns, interpolation and insertion are synonyms defined as:

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

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