pop-up vs baseball game

pop-up and baseball game both are nouns.

Word	Noun	Adjective	Verb	Adverb
pop-up	Yes	No	No	No
baseball game	Yes	No	No	No

pop-up (noun)	baseball game (noun)
a short high fly ball	a ball game played with a bat and ball between two teams of nine players; teams take turns at bat trying to score runs
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