soar, fly, float, scatter
颺 centers on movement through air: soaring, flying, floating, or scattering on the wind.
颺 combines 風 (wind) with 昜, which likely contributes the sound and the idea of rising or spreading out. The character expresses things carried or scattered by the wind.
Wind 風 lifts and spreads the bright, rising shape 昜 inside: imagine sunlight scattering like seeds on a breeze, soaring and floating away.
For ヨウ, picture a yo-yo floating upward on a gust of wind: yo -> ヨウ, and the yo-yo soars and scatters its string in the air.