climate
The term used to describe clouds that consist of globular masses that take on a billowy form is "cumulus clouds." These clouds are typically fluffy, white, and associated with fair weather, but can develop into larger storm clouds if conditions are right.
Clouds with precipitation are often referred to as nimbostratus clouds. These clouds are characterized by their uniform, thick, gray layers that produce steady rain or snow.
A nepholophile is someone who loves clouds or is fascinated by them. This term can be used to describe people who have a strong appreciation for the beauty and different formations of clouds.
Pareidolia
The term used to describe a cloud in the middle height range is "alto." These clouds typically form at altitudes between 6,500 to 20,000 feet. Examples of alto clouds include altocumulus and altostratus.
Stratus. Think of strata layers in the ground.
Oxygen
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One possible word that starts with "o" and is related to clouds is "overcast." This term is often used to describe the cloud covering the sky when it is cloudy or when the clouds are dense and block the sunlight.
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Fitness
Constitutional Monarchy