con

nouns

an argument opposed to a proposal
con
antonym
is a type of (narrower)
a fact or assertion offered as evidence that something is true
"it was a strong argument that his hypothesis was true"
a person serving a sentence in a jail or prison
a swindle in which you cheat at gambling or persuade a person to buy worthless property

verbs

deprive of by deceit
"He swindled me out of my inheritance"; "She defrauded the customers who trusted her"; "the cashier gypped me when he gave me too little change"
commit to memory; learn by heart
"Have you memorized your lines for the play yet?"

adverbs

in opposition to a proposition, opinion, etc.
"much was written pro and con"
con
antonym