bn1 
noun
Short for billion.
Bn2
abbreviation
1Baron.
2Battalion.
- retropulsive
- retroreflection
- retroreflective
- retroreflector
- retrorocket
- retrorse
- untenanted
- untended
- untenured
- Untermensch
- Untermeyer, Louis
- untestable
- untested
- untether
- unthanked
- unthankful
- unthankfully
- unthankfulness
- unthaw
- untheorised
- untheorized
- unthinkability
- unthinkable
- unthinkableness
- unthinkably