hazard has 17 distinct synonyms spread across 5 of its 6 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a source of danger; a possibility of incurring loss or misfortune
“drinking alcohol is a health hazard”
an obstacle on a golf course
Synonyms, antonyms and the broader and narrower relations for hazard come from Princeton University’s WordNet. Full sources and licences.
put at risk
“I will stake my good reputation for this”
take a risk in the hope of a favorable outcome
“When you buy these stocks you are gambling”