softball vs backstop

softball and backstop both are nouns.

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

softball (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
ball used in playing softball	(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 (verb)	backstop (verb)
	act as a backstop