buddy

As proper nouns the difference between ally and buddy

is that ally is a diminutive of the female given names alison, alice and alexandra while buddy is a male nickname.

Buster is a synonym of buddy.

As nouns the difference between buddy and buster

is that buddy is a friend or casual acquaintance while buster is someone who or something that bursts, breaks, or destroys a specified thing.

As proper nouns the difference between buddy and buster

is that buddy is a male nickname while Buster is {{surname}.

As a verb buddy

is to assign a buddy, or partner.