IME, everything that people would want tagged as rape gets called noncon, in fanfics. A lot of stuff that involves (blatant, generally sexual) coercion also gets called noncon. Depending on which value judgment the writer makes, your forced kiss would likely apply. But the only place I've found anyone making those two things separate tags is on the AO3.

None of the fan-writers I know tag for rape as opposed to noncon. And it's only ever the sexual stories that attract this "your terms aren't specific enough!" discourse - we somehow manage to agree that whump is imprecise as all heck without fans insisting we need a separate tag for "assault and battery" in fics.