There are no hits in the "big" English dictionaries (MW, Oxford, Cambridge, Collins etc.) ... only :
https://en.wiktionary.org/wiki/genocider
Noun
genocider (plural genociders)
One who commits genocide. ...
... but there are some examples in scientific publications :
https://scholar.google.co.uk/scholar?hl=en&lr...
https://brill.com/view/book/edcoll/9789004422...
How Can We Commit the Unthinkable? Genocide: The Human Cancer By Israel W. Charny (Boulder, Colorado: Westview Press, 1982, 430 pp.)
J Lador-Lederer - Israel Yearbook on Human Rights, Volume 13 (1983), 1983 - brill.com
… The first part of this book, which was written by Professor Charny alone, is a behavioural psychologist's credo on the roots of human destructiveness; on when Man commits genocide (meaning-echoing Hannah Arendt-"normal man as genocider"); and on why "there can still be …
https://defence.pk/pdf/threads/post-ratings.2...
[HTML] SENIOR MEMBER
J Shearer - defence.pk
… http ://icj.wpengine.netdna-cdn.com/...st-Pak... So based on these reports and by your logic, Pakistan army shall be allowed to be called as - 1- An army of mass rapists 2- Genocider and Mass murderers. 3- Communal and racists …
https://www.tandfonline.com/doi/abs/10.1080/0...
Reconciliation after Betrayal and Violence: Lessons from the Church in Post-genocide Rwanda
A Seah - Liturgy, 2019 - Taylor & Francis
… looted and destroyed. In its immediate wake, new social problems emerged. Mass
imprisonment left many families with no breadwinner and the stigma of being related
to a genocider. Revenge killings were reported. A flawed …
https://brill.com/view/book/edcoll/9789004422...
A contribution to the psychology of genocide: Sacrificing others to the death we fear ourselves
IW Charny - Israel Yearbook on Human Rights, Volume 10 (1980), 1980 - brill.com
… The guiding motif of the genocider is a proclamation to his victim: Better you should die than I! Much of the incomprehensible cruelty of genocide emanates from the gripping power of the genocider's own fears of death which are projected onto his victims …
... and ngrams has :
https://books.google.com/ngrams/graph?content...
... a first use of the noun in 1966, a peak between the 70s and 80s, and an end in 2011 ...
