Coining is the creation of new words without reference to the existing morphological resources of the language, that is, solely out of the sounds of the language. Coining is very rare, but googol [note the spelling] is an attested example, meaning 10100. This word was invented in 1940 by the nine-year-old nephew of a mathematician (see Compact Edition of the Ox- ford English Dictionary Vol. III Supplement to the OED Vols. I-IV: 1987 p. 317).
Abbreviation involves the shortening of existing words to create other words, usually informal versions of the originals. There are several ways to abbreviate. We may simply lop off one or more syllables, as in prof for profes- sor, doc for doctor. Usually the syllable left over provides enough information