As nouns the difference between indy and windy
is that
indy is an independent entity or
indy can be cars designed to meet the rules on the indianapolis 500 car race while
windy is (colloquial) fart.
As adjectives the difference between indy and windy
is that
indy is independent, unaffiliated (especially not affiliated with a major organization or company) while
windy is accompanied by wind or
windy can be (of a path etc) having many bends; winding, twisting or tortuous.