hitch vs unhitch

hitch is a noun but unhitch is not a noun.

Word	Noun	Adjective	Verb	Adverb
hitch	Yes	No	Yes	No
unhitch	No	No	Yes	No

hitch (noun)	unhitch (noun)
the uneven manner of walking that results from an injured leg
a knot that can be undone by pulling against the strain that holds it; a temporary knot
a connection between a vehicle and the load that it pulls
any obstruction that impedes or is burdensome
an unforeseen obstacle
the state of inactivity following an interruption
a period of time spent in military service

hitch (verb)	unhitch (verb)
to hook or entangle	unfasten or release from or as if from a hitch
connect to a vehicle:
travel by getting free rides from motorists
walk impeded by some physical limitation or injury
jump vertically, with legs stiff and back arched