Oxford Dictionaries' Word of the Year is vape, which is both a verb meaning ‘to inhale and exhale the vapour produced by an electronic cigarette or similar device’, and a noun referring to the device and the action. Vape is short for vapour or vapourise. The word has become known in the last few years due to the increasing popularity of e-cigarettes.
There are other new words based on vape, for instance vaping, vape pen (same as e-cigarette), vape shop and vape juice. The increasing ubiquity of electronic, or non-tobacco, cigarettes, has meant that manufacturers, sellers and researchers are now increasingly likely to use the term tobacco cigarettes where previously cigarettes was sufficient.
Other contenders for Oxford Dictionaries' Word of the Year were:
bae: a term of endearment for one’s romantic partner
budtender: a person who works in a cannabis dispensary or shop
contactless: relating to wireless payment methods
indyref: an abbreviation of the Scottish ‘independence referendum’ that took place in September
normcore: the wearing of unfashionable clothing as a deliberate fashion statement
slacktivism: (a blend of slacker and activism) easy actions performed over the internet in support of a political or social cause, e.g. signing an online petition or joining a campaign group on a social media website
Collins Dictionary's Word of the Year was photobomb, and Chambers had overshare.