Is cloud a proper noun or common noun?

The noun 'cloud' is a common noun, a general Word for a visible mass of condensed water vapor or other particles; a general Word for a large number of flying insects moving together; a general Word for a state or cause of gloom, suspicion, trouble, or worry; a Word for any cloud of any kind.

A proper noun is the name or title of a specific person, place, or thing; for example, Cloud County, Kansas or Silver Cloud Inns and Hotels in the state of Washington.

The Word 'cloud' is also a verb: cloud, clouds, clouding, clouded.