severance vs detachment

severance and detachment both are nouns.

Word	Noun	Adjective	Verb	Adverb
severance	Yes	No	No	No
detachment	Yes	No	No	No

As nouns, detachment is a hypernym of severance; that is, detachment is a word with a broader meaning than severance:

Other hypernyms of severance include breakup, separation.

severance (noun)	detachment (noun)
the act of severing	the act of releasing from an attachment or connection
a personal or social separation (as between opposing factions)	coming apart
	avoiding emotional involvement
	a small unit of troops of special composition
	the state of being isolated or detached