This document defines and provides examples of different types of word creation and linguistic changes that expand vocabularies over time. It discusses shibboleths, which are words or phrases used to distinguish or identify members of a group. It then covers various methods of creating new words such as acronyms, shortenings, compounding, affixation, backformation, blends, conversion, and borrowing - providing examples of each. Reduplication and recent word additions to English, Spanish, German, and Japanese are also examined.