hot-air balloon 
noun
See balloon (sense 2 of the noun).
- Cooley's anaemia
- Coolgardie
- Coolgardie safe
- cool-headed
- cool-headedness
- cool-hearted
- coolhouse
- cool hunter
- cool hunting
- coolibah
- Coolidge, Calvin
- Coolidge tube
- coolie
- Coolie Christmas
- coolie hat
- coolieism
- coolie line
- cooling board
- cooling card
- cooling center
- cooling coil
- cooling curve
- cooling fin
- cooling-off period
- cooling pond