Which words are antonyms?

recede, reseed

attract, repel

contract, retract

detect, perceive

Antonyms are words that have the opposite meaning of each other.

Recede and reseed are homonyms, which are words that sound the same, but mean two different things. They are not antonyms, as their definitions are not the opposite to each other.

Attracting is to bring interest in certain things, and repelling is to draw attention away from certain things, making those two words antonyms.

A contract is a legally binding document. Retracting is taking a statement back. These two definitions are not the opposite of each other.

Detect and perceive both have to do with being aware of something that you weren't aware of before, making them synonyms.

The two words that are antonyms are attract and repel.