Treachery (n.)

•betrayal of trust

•He was furious that she revealed his secret and never forgave her for the treachery.

Commence (v.)

•To begin or start

•The festivities will commence with a parade.

Commerce (n.)

•the activity of buying and selling goods or services

•He was the Secretary of Commerce under the last President.

Counterfeit (adj.)

•made to look like an exact copy of something in order to trick people

•The 20 dollar bill was counterfeit.

Converse (v.)

•to have a conversation

•At home we often converse in Spanish.

accommodate

•to provide what is needed or wanted for (someone or something) ; be helpful

•They were kind enough to accommodate me with a ride to the train station