Sigh. Someone has to be that guy… Might as well be me.
It’s not grammar or spelling. Origami ≠ kirigami. Origami is the art of folding a rectangular sheet of paper without making any cuts (some modern designs require some cutting but that’s cheating) while kirigami is explicitly cutting paper as “kiri” means cut and “kami” means paper.
If one really wanted to be a dick about it, it’s technically papercraft because kirigami doesn’t typically involve glue.