Aquan
Vowels are clearly fine, since they're just specific wavelengths. Hard consonants should MOSTLY be fine. The harder the better. Clicks and snaps obviously work very well, that's why cetaceans use them. What WON'T work well are siblants and dipthongs, since those rely on sounds that don't travel well through a liquid medium, or are easily obscured by normal aquatic background noise.
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