@l-j Thanks for your reply. I hear you. Even though it's legitimate language, the Scrabble Gods aren't ever going to allow it. Que sera sera.
I come to this as a person who studied solfege for many years in at Berklee College of Music, so I'm kind of a nerd about it.
Consider this: The word 'ut' is considered legit (it's in the TWL dictionary), and it's defined as "the syllable once generally used for the first tone or keynote of a scale and sometimes for the tone now commonly superseded by do". In other words it's an archaic solfege syllable. It isn't even in use anymore, lol. Yet commonly used solfege syllables sung by probably hundreds of thousands of music students the world over every day are excluded. It's kind of mysterious and arbitrary.
Whatev. I give up.