softball game vs backstop

softball game and backstop both are nouns.

Word	Noun	Adjective	Verb	Adverb
softball game	Yes	No	No	No
backstop	Yes	No	Yes	No

softball game (noun)	backstop (noun)
a game closely resembling baseball that is played on a smaller diamond and with a ball that is larger	a precaution in case of an emergency
	(baseball) a fence or screen (as behind home plate) to prevent the ball from traveling out of the playing field
	(baseball) the person who plays the position of catcher

softball game (verb)	backstop (verb)
	act as a backstop