stoop·ball 
(stpbôl′)
(stpbôl′)n.
A game patterned on baseball in which a player throws a ball against a stoop or wall and the number of bounces indicates the bases reached.
- observational
- observationally
- observatory
- observe
- observer
- observingly
- obsess
- obsession
- obsessional
- obsessionally
- obsessive
- obsessive-compulsive
- obsessive-compulsive disorder
- obsessive-compulsive personality disorder
- obsessively
- obsessiveness
- obsessor
- obsidian
- obsolesce
- obsolescence
- obsolescent
- obsolescently
- obsolete
- obsoletely
- obsoleteness