He dabbled in the occult.

she had an occult tumor.

The murderer was an occult worshipper.
Horoscopes are entertainment, not occult study.

Occult means "things that are hidden." (My socks are often hidden.....very occult)

Yes, The Golden Dawn was an important influence on modern mystical and occult practices. It introduced innovative ideas, rituals, and teachings that have had a lasting impact on various occult traditions. Many prominent figures in the occult world have been associated with or influenced by The Golden Dawn.

Horror fiction scares you... Occult fiction involves the paranormal or satanism. Horror might involve occult subjects, and Occult might scare you... so there is a lot of crossover. But that is the difference. There are Horror books that are definitely not occult and Occult books that are not horror. To read more about Occult and see more of the difference, please see the wikipedia page: http://en.wikipedia.org/wiki/Occult