My guess would be that Aule knew the most languages. Being a Valar he would've known the elven tongues as well as Valarin and probably the language of animals, he also possibly alone of the Valar knew Khuzdul the language of the dwarves as he was the one who first contrived it.
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His sword was long his lance was keen
His shining helm afar was seen
The countless stars of heavens field
Were mirrored in his silver shield
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