catch vs catch up with

catch is a noun but catch up with is not a noun.

Word	Noun	Adjective	Verb	Adverb
catch	Yes	No	Yes	No
catch up with	No	No	Yes	No

As verbs, catch and catch up with are synonyms defined as:

Other synonyms of catch include overtake.

catch (noun)	catch up with (noun)
the act of catching an object with the hands
the act of apprehending (especially apprehending a criminal)
a cooperative game in which a ball is passed back and forth
a fastener that fastens or locks a door or window
a restraint that checks the motion of something
a drawback or difficulty that is not readily evident
a break or check in the voice (usually a sign of strong emotion)
anything that is caught (especially if it is worth catching)
a person regarded as a good matrimonial prospect
the quantity that was caught

catch (verb)	catch up with (verb)
come down with	catch up with and possibly overtake
be struck or affected by	make up work that was missed due to absence at a later point
delay or hold up; prevent from proceeding on schedule or as planned
detect a blunder or misstep
discover or come upon accidentally, suddenly, or unexpectedly; catch somebody doing something or in a certain state
grasp with the mind or develop an understanding of
become aware of
be the catcher
catch up with and possibly overtake
take hold of so as to seize or restrain or stop the motion of
succeed in catching or seizing, especially after a chase
capture as if by hunting, snaring, or trapping
to hook or entangle
attract and fix
cause to become accidentally or suddenly caught, ensnared, or entangled
spread or be communicated
take in and retain
reach with a blow or hit in a particular spot
apprehend and reproduce accurately
attract; cause to be enamored
reach in time
hear, usually without the knowledge of the speakers
perceive with the senses quickly, suddenly, or momentarily
see or watch
suffer from the receipt of
perceive by hearing
get or regain something necessary, usually quickly or briefly
check oneself during an action
start burning