Noun

• S: (n) professional, pro (an athlete who plays for pay)
• direct hyponym / full hyponym
• direct hypernym / inherited hypernym / sister term
• S: (n) athlete, jock (a person trained to compete in sports)
• antonym
• W: (n) amateur [Opposed to: professional] (an athlete who does not play for pay)
• S: (n) pro (an argument in favor of a proposal)

Adjective

• S: (adj) pro (in favor of (an action or proposal etc.)) "a pro vote"

Adverb

• S: (adv) pro (in favor of a proposition, opinion, etc.)