insertion vs introduction

insertion and introduction both are nouns.

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

As nouns, insertion and introduction are synonyms defined as:

Other synonyms of insertion include intromission.

insertion (noun)	introduction (noun)
the act of putting one thing into another	the act of putting one thing into another
a message (spoken or written) that is introduced or inserted	the act of beginning something new
	the act of starting something for the first time; introducing something new
	the first section of a communication
	formally making a person known to another or to the public
	a basic or elementary instructional text
	a new proposal