"Tuiloth" or "tuilloth" for "spring flower" in Sindarin?

As a plant species' name? And what would the plural form of it be?

It would be tuilloth, plural tuillyth.

Thanks a lot, great help!

I think tuiloth, tuilos (pl. tuilyth, tuilys) could work as a root formation off √TUY.

Consider also full ethuil for forms like ethuilloth or dissimilated ethuillos.

interesting, will check all sugestions