Synonyms:
* Support: This is a general term for being in favor of something.
* Champion: This implies strong and passionate support.
* Proponent: This emphasizes someone who puts forward arguments in favor of something.
* Defender: This emphasizes someone who protects or speaks up for something or someone.
* Spokesperson: This refers to someone who represents a group or cause.
Antonyms:
* Oppose: This is the most direct opposite of advocating for something, meaning to be against it.
* Criticize: This involves expressing negative opinions or disapproval of something.
* Denounce: This is a stronger form of criticism, often with the intent of condemning something.
* Reject: This involves refusing to accept or support something.
* Disapprove: This implies a negative opinion or judgment about something.
The best synonym or antonym will depend on the specific context in which you are using the word "advocate."