The opposite (antonym) of antonym is synonym. An antonym is a word that means the opposite. A synonym is a word that means the same thing, or nearly the same thing, for a given context.
printing ?
scribbling ?
Maybe handwriting has no opposite ?
What about footwriting? Individuals with physical disabilities who have limited or no use of their hands have used their feet/toes to...
Some words do not have direct opposites [antonyms]. Antonyms do not usually substitute for phrases. The phrase "you are" has no antonym. A contrasting version of "you are" is "you are not".