How do you say pain in Russian?
— боль (bol’) (f)

Specialized synonyms for pain in Russian
burnгореть (gor'ét'); пылать (pylát')
thornшип (m) (šip); колючка (f) (koljúčka)
Antonyms for pain in Russian
pleasureудовольствие (udovól’stvije) (n)