ball vs pellet

ball and pellet both are nouns.

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

As nouns, pellet is a hypernym of ball; that is, pellet is a word with a broader meaning than ball:

Other hypernyms of ball include shot.

As nouns, pellet is a hyponym of ball; that is, pellet is a word with a more specific, narrower meaning than ball:

ball (noun)	pellet (noun)
a pitch that is not in the strike zone	a solid missile discharged from a firearm
a ball game played with a bat and ball between two teams of nine players; teams take turns at bat trying to score runs	a small rounded mass of a substance
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)	pellet (verb)
form into a ball by winding or rolling
to live very well