The definition of an advocate is someone who fights for something or someone, especially someone who fights for the rights of others.
The definition of an enthusiast is a person who is very excited about some person or thing.
A hostile power or force, such as a nation.
A personal enemy or opponent.
The definition of a champion is a person who is the best in his field or who has defeated all rivals.
One that opposes another or others, as in a battle, contest, or debate:
Find another word for proponent. In this page you can discover 16 synonyms, antonyms, idiomatic expressions, and related words for proponent, like: proposer, theorist, booster, ideologue, sceptic, advocate, advocator, protector, exponent, tenet and defender.