NATURE
1. Mother Nature
2. Environment
3. Wildlife
4. Flora and Fauna
5. Countryside, Forest
TREE
1. Greens
2. Foliage
3. Plant, bush, twig,
4. Trunk, stem, branch, root, bark, leaf, fruit
5. Greenery
6. Vegetation
7. Umbrage, leafage, verdure, growth
8. Produce
SKY
1. Atmosphere
2. Blue
3. Blue Yonder
4. Heavens
5. Horizon
6. Upper Region
RAIN
1. Drizzle
2. Storm
3. Sprinkle
4. Precipitation
5. Hurricane