"Sub-species" may not be the proper term but I was hesitant to use "breed"!
neither are correct. The term you are looking for is race, which is fine, it's just that race isn't a biological term.
....I guess if you wanted to use biology, and compare humans to like, mice or something that we use in the lab, you could just say "line."
We work with hundreds of different species of mice, some of which can interbreed with various rates of success, but even in a single species, say Mus musculus musculus, we've established many different lines within that single species that are used for various purposes, depending on what a research group may be interested in. That would be the closest analog to our human races.
....you know we did once have several different human species on the planet at the same time, but now only Homo sapiens remain. (Homo neaderthalensis, Homo heidelbergensis, The Denisovans...which we don't know enough about to extend an accurate taxa, but we interbred with them, too), were all separate species or closely related, and we interbred with all of them, and we all share a bit of DNA with each to this day.
Don't tell the religious nutjobs though, these plainly observable, incontrovertible facts of human evolution will piss them off.