go vs sober up

go is a noun but sober up is not a noun.

Word	Noun	Adjective	Verb	Adverb
go	Yes	Yes	Yes	No
sober up	No	No	Yes	No

As verbs, sober up is a hyponym of go; that is, sober up is a word with a more specific, narrower meaning than go:

Other hyponyms of go include sober, sober, work, take effect, run, take, break, settle.

go (noun)	sober up (noun)
a board game for two players who place counters on a grid; the object is to surround and so capture the opponent's counters
a usually brief attempt
street names for methylenedioxymethamphetamine
a time period for working (after which you will be relieved by someone else)

go (adjective)	sober up (adjective)
functioning correctly and ready for action

go (verb)	sober up (verb)
pass from physical life and lose all bodily attributes and functions necessary to sustain life	become sober after excessive alcohol consumption
follow a certain course	become more realistic
progress by being changed
stop operating or functioning
enter or assume a certain state or condition
be abolished or discarded
give support (to) or make a choice (of) one out of a group or number
have a turn; make one's move in a game
to be spent or finished
be spent
perform as expected when applied
go through in search of something; search through someone's belongings in an unauthorized way
change location; move, travel, or proceed, also metaphorically
move away from a place into another direction
begin or set in motion
make a certain noise or sound
follow a procedure or take a course
stretch out over a distance, space, time, or scope; run or extend between two points or beyond a certain point
have a particular form
pass, fare, or elapse; of a certain state of affairs or action
be in the right place or situation
be the right size or shape; fit correctly or as desired
be awarded; be allotted
be or continue to be in a certain condition
lead, extend, or afford access
be ranked or compare
blend or harmonize
be sounded, played, or expressed
be contained in
continue to live and avoid dying