stat·is·ti·cian 
(stăt′ĭ-stĭshən)
(stăt′ĭ-stĭshən)n.
1. A mathematician specializing in statistics.
2. A compiler of statistical data.
- obsequy
- observable
- observably
- observance
- observant
- observantly
- observation
- observational
- observationally
- observatory
- observe
- observer
- observingly
- obsess
- obsession
- obsessional
- obsessionally
- obsessive
- obsessive-compulsive
- obsessive-compulsive disorder
- obsessive-compulsive personality disorder
- obsessively
- obsessiveness
- obsessor
- obsidian