-luck: push your luck, wish sb luck, trust to luck, bring you luck, the luck of the draw, a stroke/piece of luck, as luck would have it, in luck, with any luck
-natural: completely/totally natural, natural causes, natural ability, natural resources, natural selection
-nature: the nature of, by nature, in nature, Mother Nature, human nature, second nature
-odds: the odds of doing, the odds are (that), the odds are in favour of/against, against all the odds
-rain: rain hard/heavily, pour with rain, heavy/light rain, rainbow, rainwater, caught in the rain
-risk: risk sth on, risk doing, tisk one's life, take a risk, run the risk of, put sth at risk, pose a risk to, the risk of, ath the risk of doing
-sun: sun yourself, in the sun, sunbathe, sunlight, sunrise, sunset, sunshine
-threat: pose a threat (to), face a threat, under threat, threat of, idle threat, bomb threat, death threat
-weather: good/bad/etc weather, freak weather, in all weathers, under the weather, weather forecast, weatherproof
-wind: light/strong wind, gust of wind, in the wind, winds of change