Heart River 
(härt)
(härt) A river, about 290 km (180 mi) long, of southwest North Dakota flowing eastward to the Missouri River near Bismarck.
- black knot
- black lead
- blackleg
- black-legged tick
- black letter
- black light
- black liquor
- blacklist
- blacklister
- black locust
- black lung
- blackly
- black magic
- blackmail
- blackmailer
- Black Maria
- black market
- black-market
- black-market
- black-marketeer
- black-marketeering
- black-marketer
- black mass
- black measles
- black medic