Is kitten a proper noun or common noun?

The noun 'kite' is a common noun, a Word for any of that type of bird or any toy flown in the wind on a long string.

A proper noun is the name of a specific person, place, thing, or a title; for example:

• Dr. Ronald G. Kite, Internal Medicine, Los Gatos, CA
• Kite, GA 31049
• Kite Hill Cassucio Dairy Free Cheese
• "The Kite Runner", a novel by Khaled Hosseini