危険【きけん】
danger, peril, hazard, risk
保険【ほけん】
insurance, guarantee
冒険【ぼうけん】
adventure, venture, venture which is unlikely to succeed, risky attempt, danger, hazard, risk
生命保険【せいめいほけん】
life insurance
険悪【けんあく】
dangerous, perilous, threatening, stormy, volatile, tense, critical, serious, stern (expression), hostile (attitude), sharp, harsh
険しい【けわしい】
precipitous, rugged, inaccessible, impregnable, steep, grim, severe, stern