ball vs fly ball

ball and fly ball both are nouns.

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

ball (noun)	fly ball (noun)
a pitch that is not in the strike zone	(baseball) a hit that flies up in the air
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)	fly ball (verb)
form into a ball by winding or rolling
to live very well