Reasons why you can not create a community

i have been asking everyone to tell me all possible info when they faced failures and those are the three main reasons i have found
1- Using NSFW or banned words :

this includes war, gay ,lesbian, kill and term deemed NSFW
2- The name you are trying to get is reserved :
this is mostly related to some brands and some of the larger subreddits , so if you are trying to claim a name of one of the more popular subs theres a high chance its reserved
3- Orphaned communities :
those communities were started by users who either got banned or deleted their accounts (mostly banned) , in those cases the community still exists but it has no moderator , @forest just told us they intend to release them at some point
so just be patient !
i hope this helps to clarify some of the unwritten rules for those facing problems
ps: the same applies to usernames .