BonnBonn /bɒn $ bɑːn/ 
the capital city of the Federal Republic of Germany from 1949 until 1990
the capital city of the Federal Republic of Germany from 1949 until 1990- double duty
- double-edged
- double entendre
- double fault
- double feature
- double-figure
- double figures
- double first
- double-glaze
- double glazing
- double-header
- double helix
- double indemnity
- double jeopardy
- double-jointed
- double life
- double negative
- double-park
- double play
- double-quick
- double quick
- double-sided
- doublespeak
- double standard
- doublet