enclosure vs insertion

enclosure and insertion both are nouns.

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

As nouns, insertion is a hypernym of enclosure; that is, insertion is a word with a broader meaning than enclosure:

Other hypernyms of enclosure include introduction, intromission.

enclosure (noun)	insertion (noun)
the act of enclosing something inside something else	the act of putting one thing into another
a structure consisting of an area that has been enclosed for some purpose	a message (spoken or written) that is introduced or inserted
something (usually a supporting document) that is enclosed in an envelope with a covering letter
a naturally enclosed space