to feign ignorance, to play dumb, to pretend to not know or understand something

(backgammon) backgammon

(dated slang) a woman who is attractive from behind, usually in reference to her buttocks. / (dated slang, in particular) butterface: A woman who is attractive from behind but ugly from the front.

Khabarovsk (a city in Russia)

drastic

Starbucks

airbag (protective system in automobiles)

balcony (structure overlooking a stage) / balcony (structure extending from a building)

backup (copy of file or record)

backlash (a strong adverse reaction to a political or social development)