what is the russian word for Thank you?

Answer 1

I can't produce the Cyrillic letters, but a rough English pronunciation is
SPAASEEVO

Answer 2

Spasiba means 'thank you', and there is no harm in sprinkling it liberally through any conversation with a Russian.
Pronunciation is Spas-ee-bah, with the emphasis on the 'ee'.

Sra

P.S. In the Cyrillic alphabet = Спасибо