Interesting enough sometimes fans will tell me I am spelling come wrong when I don't use cum as a verb.
Estragon was great at pointing out my excessive use of cum as a verb and a noun....
As already mentioned there clearly is a difference....
Thanks for the plug, Silk. But I'm coming (no pun intended) around to the view that "come" as a verb for ejaculating-orgasming will morph into "cum", and the differences in spelling will erode, more or less quickly. I've said before that trying to define our crazy English language is like trying to hit a swiftly moving target. While we may speak of "prescriptive" and "descriptive" dictionaries, and quote manuals of style and whatever authorities there may be, popular speech and the zeitgeist will defeat all of us editors.