ball vs ERA

ball and ERA both are nouns.

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

ball (noun)	ERA (noun)
a pitch that is not in the strike zone	(baseball) a measure of a pitcher's effectiveness; calculated as the average number of earned runs allowed by the pitcher for every nine innings pitched
a ball game played with a bat and ball between two teams of nine players; teams take turns at bat trying to score runs
round object that is hit or thrown or kicked in games
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)	ERA (verb)
form into a ball by winding or rolling
to live very well