1.Clipped words are those created by clipping part of a word, leaving only a piece of the old word.①截除词尾，②截除词首， ③截除词首尾， ④截除词腰 2.Acronymy is the process of forming new words by joining the initial letters of names of social and political organizations or special phrases and technical terms.(1) Initialisms are words formed from the initial letters of words and pronounced as letters.（ BC)← before Christ 公元前
(BBC)←British Broadcasting Corporation (2) Acronyms are words formed from the initial letters of word and pronounced as words.（ SARS)← severe acute respiratory syndrome. 4. Blends are words that are combined by parts of two words or a word plus a part of another word.
Back formation
Back formation is a process of word-formation by which a word is created by the deletion of a supposed affix.
1. 名词性后缀2.形容词性后缀
Invention/Coinage
The introduction of a completely new word
Mostly brand names:
Kodak, Coke
