stop vs break up

stop is a noun but break up is not a noun.

Word	Noun	Adjective	Verb	Adverb
stop	Yes	No	Yes	No
break up	No	No	Yes	No

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

Other hyponyms of stop include fracture, bog, bog down, cut off, disrupt, interrupt.

As verbs, break up is a hypernym of stop; that is, break up is a word with a broader meaning than stop:

Other hypernyms of stop include cut off, disrupt, interrupt.

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

stop: have an end, in a temporal, spatial, or quantitative sense; either spatial or metaphorical
break up: close at the end of a session

stop (noun)	break up (noun)
the act of stopping something
a brief stay in the course of a journey
a restraint that checks the motion of something
an obstruction in a pipe or tube
a mechanical device in a camera that controls size of aperture of the lens
(music) a knob on an organ that is pulled to change the sound quality from the organ pipes
a consonant produced by stopping the flow of air at some point and suddenly releasing it
a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations
the event of something ending
a spot where something halts or pauses
the state of inactivity following an interruption

stop (verb)	break up (verb)
prevent completion	laugh unrestrainedly
stop and wait, as if awaiting further instructions or developments	break or cause to break into pieces
hold back, as of a danger or an enemy; check the expansion or influence of	come to an end
seize on its way	separate (substances) into constituent elements or parts
render unsuitable for passage	cause to go into a solution
come to a halt, stop moving	cause to separate
cause to end	close at the end of a session
interrupt a trip	bring the association of to an end or cause to break up
stop from happening or developing	make a break in
put an end to a state or an activity	set or keep apart
have an end, in a temporal, spatial, or quantitative sense; either spatial or metaphorical	break violently or noisily; smash
	attack with or as if with a pickaxe of ice or rocky ground, for example
	release ice
	destroy the completeness of a set of related items
	take apart into its constituent pieces
	suffer a nervous breakdown
	disband
	to cause to separate and go in different directions
	discontinue an association or relation; go different ways