Translate Okay from English to Japanese.?

tiger in Japanese is "tora"

however younger people today often use tiga

coincidently "tora" was the code Word used by the Japanese navy to launch the attack on Pearl Harbour

great has many Words in Japanese

okinatora = big tiger

dekaitora = huge tiger

i don't understand in what context you want to use great tiger, if you put it in a sentence I'll give you a better answer