ball vs ballpark

ball and ballpark both are nouns.

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

ball (noun)	ballpark (noun)
a pitch that is not in the strike zone	a facility in which ball games are played (especially baseball games)
a ball game played with a bat and ball between two teams of nine players; teams take turns at bat trying to score runs	near to the scope or range of something
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)	ballpark (verb)
form into a ball by winding or rolling
to live very well