It's incredibly ambiguous. There are very few sets of people who agree on the list of ongoing genocides, much less historic ones. The only places where there is even a semblance of agreement is in Europe and urban America, and that's largely due to deferral to our institutions.
> There's no ambiguity as to what Israel is doing
I agree. That doesn't mean it's beyond discussion or debate. I think it's a genocide. I also think that term has been mangled, particularly online, to the point that it's virtually meaningless. (One of the problems with the term is it's grammatically odd. A homicide is a completed murder. Attempted murder is different. A genocide, completed, is an extermination or annihilation. But we give the ongoing project the same grammar as, in other cases, an act.)