The purpose of this page is to collect a fairly comprehensive list of derivational morphology methods (e.g., affixes) which can be used to derive more vocabulary from existing roots. Several existing conlangs have extensive derivational morphology methods (e.g., Volapük, Esperanto, Ithkuil, Ladekwa, and many others), but as far as we can tell there is no comprehensive list comparing all their affix inventories, those of natural languages, and other possible ways to derive more words from roots. Gary Shannon has made a start at a list of derivation functions (dead link).