We use 'гарячо' for 'hot'. And yes, 'кішка' is a Russian word for 'cat'... I was always taught 'кітка' for a female cat and 'кіт' for s male cat. But never 'кішка'.
There was this crazy song called 'Who Stole the Kishka'...but it was supposed to be 'Who Stole the KYSHKA'...(Someone was hungry...LOL).