disconnect vs disunite

disconnect is a noun but disunite is not a noun.

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

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

Other hypernyms of disconnect include divide, part, separate.

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

disconnect (verb)	disunite (verb)
make disconnected, disjoin or unfasten	force, take, or pull apart
pull the plug of (electrical appliances) and render inoperable	part; cease or break association with