Goddessship is an English word meaning "The state or position of being a goddess". It is one of the few English words in existence that uses three of the same letters adjacently. Here is a list of some other words that I know of:
In some American dictionaries, all triple-lettered words are hyphenated. That doesn't make sense to me: aa-a? agree-eth? ess-sse? seems awkward.
Typically, the word is used with a respective moniker in front, as in "your goddessship", although the term is sometimes hyphenated (your Goddessship). Here are some books in which the term was used:
http://books.google.com/books?sourceid=navclient&ie=UTF-8&rls=RNWE,RNWE:2005-39,RNWE:en&q=goddessship&um=1&sa=N&tab=wp