Can I post word games (as community wiki) on this site? It will improve vocabulary. I would like an answer from a moderator.
A decade+ later, I think very few people on this site would agree with the 'yes' in the (since deleted) accepted answer. Though the tag word-games has 21 questions, very few of the un-closed, un-locked ones are actual word games, probably because puzzles and stuff aren't really about the English language and its usage; posting one will most likely result in your question's closure.
This may not be useful if the goal (as is yours) is to improve people's vocabulary, but Puzzling.SE, which has tags for [wordplay], [word-game], and language, is one place where such word games may be posted. Apparently, EL&U chat is also a place for this, although you probably wouldn't be able to post more elaborate games.