Are there different kinds of snoring?

I’ve tried everything to make my SO quit it with the damned snoring. (He refuses to see a doctor about possible sleep apnea - trust me, I’ve tried.) The thing is, everybody says “Get him to sleep on his side!” Well, in addition to that being practically impossible (he won’t sleep in a shirt so I can’t pin a tennis ball in a sock to it, if he starts out on his side he goes right back to his back once he goes to sleep, etc.) on the times when he does sleep on his side it doesn’t really seem to affect his snoring much at all. Does that mean he has a different kind of snoring than most back sleeping snorers do? Could it be, like, his nose instead of his throat?

The Master speaks (and quite recently, too):

Oh, and there also seems to be an active thread on Cecil’s column over here.

I assume it’s not tongue-based, since wouldn’t that not happen on your side?

That’s my guess. Must be a nose-snore.