Definition of risk :
1. Hazard of loss; liabillity to loss in property.
2. Hazard; danger; peril; exposure to loss, injury, or destruction.
3. To expose to risk, hazard, or peril; to venture; as, to risk goods on board of a ship; to risk one's person in battle; to risk one's fame by a publication.
4. To incur the risk or danger of; as, to risk a battle.
guess, adventure, stake, peril, risk of infection, opportunity, pretend, put on the line, lay on the line, take chances, uncertainty, luck, gambling, fortuity, bump, take a chance, happen, speculation, contingency, insecurity, fortune, encounter, prospect, safety, run a risk, imperilment, risk of exposure, find, riskiness
chance (part of speech: verb)
endanger (part of speech: verb)
danger (part of speech: noun)