Synonyms.
fast
fast
quick, speedy, at once
fast, quick, speedy, rapid, ...
well a synonym would be a restaurant and a antonym would be a fast food restaurant
It is to go fast an he antonym is to go slow
The antonym of the word 'synonym' is 'antonym'.
speedy, fast, express, active, hurried, prompt, quickened, swift
An antonym means "opposite". So an antonym for the word synonym is antonym.
Well, the antonym of antonym is synonym, and the antonym of synonym is antonym. Also, the synonym for antonym is opposite, and the synonym for synonym is related. I hope that helps because there really is no other word, they are opposites.
antonym: in synonym: away
Synonym: Whine Antonym : Compliment