"Resisting orgasm" is for when a character is preventing themselves from cumming. They don't want to cum. "Orgasm denial" is for when a character is being prevented from cumming by not thsmselves. They want to cum, but cannot.

this absolutely needs to be a tag

They do overlap a lot, but they are distinct. "Resisting orgasm" implies 1. that they're being sexually stimulated and approaching orgasm as a result, and 2. they don't want to orgasm. A situation where someone is free to cum, or being forced to cum, but doesn't want to, wouldn't be "orgasm denial". It's kinda like how omorashi is distinct from watersports.

What would be the difference between this tag and orgasm denial? I feel like orgasm denial is an umbrella term for all those scenarios

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