Coriander leaves are cilantro leaves. The seeds are called coriander-go figure!
I think the Brits refer to the green plant as ‘Coriander’, while we call the greens ‘Cilantro’ and use Coriander when referring to the seeds.
Two years ago I got positively hooked on cilantro. I grew some and it tasted so much better and fresher than any store bunch I had tried. I eat a lot from the garden. Just chopped with tomato and onion and a tiny amount of pickled jalapenos (mine) and a little juice. I could just eat it out of the bowl.