pop vs pop out

pop is a noun but pop out is not a noun.

Word	Noun	Adjective	Verb	Adverb
pop	Yes	Yes	Yes	Yes
pop out	No	No	Yes	No

As verbs, pop and pop out are synonyms defined as:

Other synonyms of pop include bug out, bulge, bulge out, come out, protrude, start.

As verbs, pop and pop out are synonyms defined as:

Other synonyms of pop include burst out, crop up, pop up.

pop (noun)	pop out (noun)
music of general appeal to teenagers; a bland watered-down version of rock'n'roll with more rhythm and harmony and an emphasis on romantic love
a sharp explosive sound as from a gunshot or drawing a cork
a sweet drink containing carbonated water and flavoring
an informal term for a father; probably derived from baby talk

pop (adjective)	pop out (adjective)
(of music or art) new and of general appeal (especially among young people)

pop (verb)	pop out (verb)
burst open with a sharp, explosive sound	come out suddenly or forcefully
cause to burst with a loud, explosive sound	exit briefly
fire a weapon with a loud explosive noise	bulge outward
take drugs, especially orally	appear suddenly or unexpectedly; happen unexpectedly
drink down entirely
hit a pop-fly
put or thrust suddenly and forcefully
hit or strike
release suddenly
bulge outward
make a sharp explosive noise
appear suddenly or unexpectedly; happen unexpectedly
cause to make a sharp explosive sound

pop (adverb)	pop out (adverb)
like a pop or with a pop