"Climactic" vs. "Climatic"

Given that “climax” does have a sexual meaning, this is at least somewhat relevant.

The adjective that means “relating to climax” is spelled “climactic”, with three C’s in all. The very similarly spelled word “climatic” (with only two C’s) means “relating to climate”, as in the Climatic Research Unit. So, you might write about “climactic moans,” but not “climatic moans” (unless it really has to do with climate).

(Extra tidbit: When I tried searching “climactic moans” (exact phrase) on Google, it actually said Did you mean: “climatic moans”. That’s right, Google suggested a misspelling because so many people use it.)