“Genocide” is a word sometimes used colloquially for conflicts with large, targeted campaigns and high civilian death rates. It is also used in official capacities, with specific definitions — in Article II of the UN’s “Convention on the Prevention and Punishment of Genocide,” Genocide is defined:

[Genocide is] any of the following acts committed with the intent to destroy, in whole or in part, a national, ethnic, racial or religious group, as such:
(a) Killing members of the group;
(b) Causing serious bodily or mental harm to members of the group;
(c) Deliberately inflicting on the group conditions of life calculated to bring about its physical destruction in whole or in part;
(d) Imposing measures intended to prevent births within the group;
(e) Forcibly transferring children of the group to another group.

When a country says another nation is responsible for a “genocide,” it is a very politically volatile move. Many countries, even the U.N., are known to tiptoe around the word, as it would very reasonably require an extreme, follow-up response. And so they tend to call it something else.

There have been countless sources of documentation in Myanmar of mass executions, using rape as a weapon, dashing children against trees — the list is long, and most recently they are targeted at the Rohingya people. Almost 700,000 Rohingya have been driven from their homes and into tight refugee camps on the border of Bangladesh. The targeting has been clearly directed at the Rohingya as a whole, not at militants or people within a specific border — the Rohingya people themselves have been marked by the Myanmar government.