Switch
Part of speech: noun
Definition: A device to turn electric current on and off or direct its flow. A movable section of railroad track which allows the train to be directed down one of two destination tracks; point. A slender woody plant stem used as a whip. A command line notation allowing specification of optional behavior. A networking device connecting multiple wires, allowing them to communicate simultaneously, when possible. Compare to the less efficient hub device that solely duplicates network packets to each wire. A system of specialized relays, computer hardware, or other equipment which allows the interconnection of a calling party's telephone line with any called party's line. One who is willing to take either a sadistic or a masochistic role.
Part of speech: verb
Definition: To exchange. To change (something) to the specified state using a switch. To whip or hit with a switch. To change places, tasks, etc. To get angry suddenly; to quickly or unreasonably become enraged.
Example sentence: If you believe you can, you probably can. If you believe you won't, you most assuredly won't. Belief is the ignition switch that gets you off the launching pad.
Exchange
Part of speech: noun
Definition: An act of exchanging or trading.A place for conducting trading.(telephony, US only?) The fourth through sixth digits of a ten-digit phone number (the first three before the introduction of area codes).A conversation.
Part of speech: verb
Definition: To trade or barter.To replace with a similar item.
Example sentence: At its core, bitcoin is a smart currency designed by very forward-thinking engineers. It eliminates the need for banks, gets rid of credit card fees, currency exchange fees, money transfer fees, and reduces the need for lawyers in transitions... all good things.