The definition of an enthusiast is a person who is very excited about some person or thing.
The definition of a champion is a person who is the best in his field or who has defeated all rivals.
One who protects; a guardian.
An additional dose of an immunizing agent, such as a vaccine or toxoid, given at a time period of weeks to years after the initial dose to sustain the immune response elicited by the first dose. Tetanus, diphtheria, and measles vaccines are commonly given in booster doses.
One that opposes another or others, as in a battle, contest, or debate:
A hostile power or force, such as a nation.
A personal enemy or opponent.
Find another word for proponent. In this page you can discover 12 synonyms, antonyms, idiomatic expressions, and related words for proponent, like: defender, advocate, enthusiast, champion, protector, booster, opponent, enemy, foe, advocator and exponent.