"flamma" & "ignis," from which we get the English words "flame" and "ignition," are usually the most appropriate. Though there is also "caminus," for a contained fire, fireplace; or "deflagratio," meaning, "a burning."
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Flamae. Technically, this is flames, but it usually makes more sense than the singular flama.
The root of the English word "fire" is Germanic, not Latin, but it is cognate to the Greek word "pyr".