incasement vs enclosure

incasement and enclosure both are nouns.

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

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

Other hypernyms of incasement include enclosing, envelopment, inclosure.

incasement (noun)	enclosure (noun)
the act of enclosing something in a case	the act of enclosing something inside something else
	a structure consisting of an area that has been enclosed for some purpose
	something (usually a supporting document) that is enclosed in an envelope with a covering letter
	a naturally enclosed space