What is the gender of the word "рыба-кит"? Should I say "огромная рыба-кит" or "огромный рыба-кит"?
Also, how should I change it if it is not in nominative case?
Gramota.ru suggests that рыба-кит is not used in any other forms, but as a native speaker I could easily imagine a context like "Богатырь победил рыб...-кит...".
рыба-кит
, the author might have usedему
simply to indicate the gender of the fish in question, similarly to how one could useему
withрыба
(as there is noрыб
orрыбиха
to differentiate between genders of an imaginary fish family).победил рыбу-кит
sounds right, whileпобедил рыбу-кита
does not.