> Genocide is about the extermination of a people.

Thus resulting a lot of civ casualties. If it's genocide is for ever up to debate. Civ casualties are usually not that debatable. Without a large number (%) of civ deaths in some place there cannot be a genocide.

It can still be genocide without murder. Things like preventing childbirth or deporting/stealing children (like what Putin is wanted for) also fall under genocide.

For the most part "mass murder" and "genocide" have a lot of overlap. But it's not the same crime.