Noun

• S: (n) professional, pro (an athlete who plays for pay)
• S: (n) pro (an argument in favor of a proposal)
• direct hypernym / inherited hypernym / sister term
• S: (n) argument, statement (a fact or assertion offered as evidence that something is true) "it was a strong argument that his hypothesis was true"
• S: (n) proof (a formal series of statements showing that if one thing is true something else necessarily follows from it)
• S: (n) counterargument (an argument offered in opposition to another argument)
• S: (n) pro (an argument in favor of a proposal)
• S: (n) con (an argument opposed to a proposal)
• S: (n) case (a statement of facts and reasons used to support an argument) "he stated his case clearly"
• S: (n) clincher, determiner, determining factor (an argument that is conclusive)
• S: (n) adducing (citing as evidence or proof)
• S: (n) last word (the final statement in a verbal argument) "she always gets the last word"
• S: (n) specious argument (an argument that appears good at first view but is really fallacious)
• antonym

Adjective

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

Adverb

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