decouple vs disconnect

decouple is not a noun while disconnect is a noun.

Word	Noun	Adjective	Verb	Adverb
decouple	No	No	Yes	No
disconnect	Yes	No	Yes	No

As verbs, disconnect is a hypernym of decouple; that is, disconnect is a word with a broader meaning than decouple:

decouple (noun)	disconnect (noun)
	an unbridgeable disparity (as from a failure of understanding)

decouple (verb)	disconnect (verb)
reduce or eliminate the coupling of (one circuit or part to another)	make disconnected, disjoin or unfasten
eliminate airborne shock waves from (an explosive)	pull the plug of (electrical appliances) and render inoperable
regard as unconnected
disconnect or separate