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Orcas Are Known To Be Highly Intelligent And Social Creatures. So It May Come As No Surprise That A Captive Killer Whale Could Learn To Speak (Probably With No Understanding) In Other Dialects, For Example, Say Human Words Like Hello And Bye. Elephants And Seals Have Also Been Known To Say Human Words Too.

An orca has been taught to "say" human words in a world-first

https://www.sciencealert.com/orca-killer-whale-learns-to-mimic-human-speech-hello-bye-bye-language

A captive orca named Wikie has become the first killer whale known to recognisably make sounds that are not part of her native repertoire – including human language words like “hello” and “bye bye”.