危険 is read as きけん (kiken) and means risk.
きけん
kiken
きけんせい
(degree of) risk
きけんぶんし
person who poses a high risk
きけんてあて
hazard pay
きけんじんぶつ
loose cannon
きけんなかんけい
Dangerous Liaisons (novel, film)
きけんび
unsafe day (when unprotected sex can to lead to conception)
きけんじょうほう
information about a danger
きけんしそう
dangerous thoughts
きけんうんてん
dangerous driving
きけんいんし
risk factor
きけんぶつ
hazardous materials
きけんしんごう
danger signal