Right from that link:
"Reacting to reports of the more than 400 deaths in Bucha, U.S. President Joe Biden denounced Putin as a “war criminal.”"
I call it a genocide, official sources seem to use the word "massacre".
I call it a genocide because russian orcs are targeting civilians, including children, with rapes and murders, and their main goal seems to collectively be wiping out Ukraine in culture and existence alike. That's why I personally will call it a genocide.