pop-up vs pop fly

pop-up and pop fly both are nouns.

Word	Noun	Adjective	Verb	Adverb
pop-up	Yes	No	No	No
pop fly	Yes	No	No	No

As nouns, pop-up and pop fly are synonyms defined as:

Other synonyms of pop-up include pop-fly.

pop-up (noun)	pop fly (noun)
a short high fly ball	a short high fly ball
a store that is open for a limited period of time on temporary premises
a book (usually for children) that contains one or more pages such that a three-dimensional structure rises up when a page is opened