exit vs undock

exit is a noun but undock is not a noun.

Word	Noun	Adjective	Verb	Adverb
exit	Yes	No	Yes	No
undock	No	No	Yes	No

As verbs, undock is a hyponym of exit; that is, undock is a word with a more specific, narrower meaning than exit:

exit (noun)	undock (noun)
the act of going out
an opening that permits escape or release
euphemistic expressions for death

exit (verb)	undock (verb)
pass from physical life and lose all bodily attributes and functions necessary to sustain life	take (a ship) out of a dock
lose the lead	move out of a dock
move out of or depart from