What was the original title of Ghostbusters?

What was the original title of Ghostbusters?
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Coming from a long line of spiritualists, it seems like Dan Aykroyd was always destined to write a movie about ghosts.

But when he and Harold Ramis teamed up to start working in earnest on the concept of 1984's Ghostbusters, it took multiple iterations before finally landing on the all-time classic comedy/fantasy/horror-ish movie we still know and love nearly 40 years later.

One of the key pieces that changed over time was the title — which is pretty hard to swallow considering the Ray Parker song is just so damn catchy. What was the original title of Ghostbusters?

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