Question: How do I tell the difference between coming and having an orgasm?

Answer: Because most people use these terms interchangeably, there might not be any difference to tell!

However, some people distinguish between an orgasm and female ejaculation.  In that case, they might only use the term "come" to refer to ejaculating.   

Usually though, coming (sometimes spelled cumming) is just a slang term for an orgasm.

An orgasm is the release of all the muscle tension that has built up during sexual arousal. This is generally combined with a flooding of pleasurable hormones into the bloodstream. The combination can feel like a super pleasurable release that can make you happy, sleepy, relaxed or giddy.

Most women need clitoral stimulation in order to orgasm, and don’t just come from vaginal penetration alone. Unfortunately, up to one in three women have difficulty reaching orgasm. If this is an issue for you, masturbating can be a great way to get to know your body and figure out what feels good.