A bittur is an obsolete term for a bittern - any of several bird species in the Botaurinae subfamily of herons.
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 4 words with the pattern BIT--R. That is, six letter words with 1st letter B and 2nd letter I and 3rd letter T and 6th letter R. In alphabetical order, they are: bitser bitter bittor bittur
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 18 words with the pattern BI---R. That is, six letter words with 1st letter B and 2nd letter I and 6th letter R. In alphabetical order, they are: bibber bicker bidder biffer bifter bigger bilker biller binder binger birder birler bismar bister bitser bitter bittor bittur