The correct spelling of the term referring to an individual who creates films is "filmmaker."
According to the Oxford English Dictionary, the term "filmmaker" has been in use since the early 20th century and has been widely recognized as the standard spelling in the English language. The term has also been adopted by numerous reputable film organizations, such as the Academy Awards, which presents an annual award for Best Director to a recognized filmmaker.
The spelling "film-maker" is not commonly used and is considered a less accepted variation of the term. This spelling is not found in the Oxford English Dictionary or in the majority of reputable film-related sources.
In conclusion, "filmmaker" is the correct spelling for an individual who creates films, as it is the widely recognized standard in the English language and has been adopted by numerous reputable film organizations.