pass vs come about

pass is a noun but come about is not a noun.

Word	Noun	Adjective	Verb	Adverb
pass	Yes	Yes	Yes	No
come about	No	No	Yes	No

As verbs, pass and come about are synonyms defined as:

Other synonyms of pass include fall out, go on, hap, happen, occur, pass off, take place.

pass (noun)	come about (noun)
(sports) the act of throwing the ball to another member of your team
a usually brief attempt
(American football) a play that involves one player throwing the ball to a teammate
(baseball) an advance to first base by a batter who receives four balls
success in satisfying a test or requirement
a flight or run by an aircraft over a target
a permit to enter or leave a military installation
any authorization to pass or go somewhere
an automatic advance to the next round in a tournament without playing an opponent
a document indicating permission to do something without restrictions
a complimentary ticket
a difficult juncture
one complete cycle of operations (as by a computer)
the location in a range of mountains of a geological formation that is lower than the surrounding peaks
a bad or difficult situation or state of affairs
(military) a written leave of absence

pass (adjective)	come about (adjective)
of advancing the ball by throwing it

pass (verb)	come about (verb)
eliminate from the body	come to pass
come to pass
disappear gradually
pass from physical life and lose all bodily attributes and functions necessary to sustain life
grant authorization or clearance for
transmit information
pass over, across, or through
go across or through
travel past
pass into a specified state or condition; sink into
for time to move forward
cause to pass
move past
place into the hands or custody of
throw (a ball) to another player
transfer to another; of rights or property
be inherited by
make laws, bills, etc. or bring into effect by legislation
go unchallenged; be approved
accept or judge as acceptable
go successfully through a test or a selection process
allow to go without comment or censure
use up a period of time in a specific way
be superior or better than some standard
stretch out over a distance, space, time, or scope; run or extend between two points or beyond a certain point