As verbs the difference between fist and fiat
is that
fist is to break wind while
fiat is to make (something) happen.
As nouns the difference between fist and fiat
is that
fist is the act of breaking wind; fise while
fiat is an authoritative command or order to do something; an effectual decree.
As an initialism FIST
is future Infantry Soldier Technology.
As a proper noun Fiat is
an automobile manufactured by the Italian firm
Fiat S.p.A..
As a phrase FIAT is
fix it again Tony, a derogatory slang phrase for Fiat, a backronym.