Puzzle such as this

WordNet Word definitions in WordNet
n. any game involving the formation or alteration or discovery of words

Wiktionary Word definitions in Wiktionary
alt. A game which involves manipulate words. n. A game which involves manipulate words.

Wikipedia Word definitions in Wikipedia
Word games (also called word game puzzles ) are spoken or board games often designed to test ability with language or to explore its properties. Word games are generally engaged as a source of entertainment , but have been found to serve an educational ...