Mus·sel·shell 
(mŭsəl-shĕl′)
(mŭsəl-shĕl′) A river of central Montana flowing about 560 km (350 mi) east then north to the Missouri River.
- black duck
- black dwarf
- black economy
- blacken
- blackener
- Black English
- Black English Vernacular
- black eye
- black-eyed pea
- black-eyed Susan
- blackface
- blackfish
- black flag
- black-flag
- black fly
- blackfly
- Blackfoot
- black-footed albatross
- black-footed ferret
- Blackfoot Sioux
- Black Forest
- black frost
- black gold
- black grouse
- blackguard