ball vs backstop

ball and backstop both are nouns.

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

ball (noun)	backstop (noun)
a pitch that is not in the strike zone	a precaution in case of an emergency
a ball game played with a bat and ball between two teams of nine players; teams take turns at bat trying to score runs	(baseball) a fence or screen (as behind home plate) to prevent the ball from traveling out of the playing field
round object that is hit or thrown or kicked in games	(baseball) the person who plays the position of catcher
a spherical object used as a plaything
a solid projectile that is shot by a musket
a more or less rounded anatomical body or mass
one of the two male reproductive glands that produce spermatozoa and secrete androgens
a lavish dance requiring formal attire
a compact mass
an object with a spherical shape

ball (verb)	backstop (verb)
form into a ball by winding or rolling	act as a backstop
to live very well