鸦 ⇒
乌鸦 wūyā, [烏鴉], crow/raven
涂鸦 túyā, [塗鴉], graffiti/scrawl/poor calligraphy/to write badly/to scribble
鸦片 yāpiàn, [鴉片], opium (loanword)
鸦 yā, [鴉]/[鵶], crow, variant of 鴉|鸦[yā]
鸦雀无声 yāquèwúshēng, [鴉雀無聲], lit. crow and peacock make no sound/absolute silence (idiom); not a single voice...
渡鸦 dùyā, [渡鴉], (bird species of China) common raven (Corvus corax)