Pallid
Pale, Pallor
noun, な adjective, の adjective
If you're pale white, you're pale, or pallid. This word is usually used to talk about the pallor of someone's face.
そうはく
This is a jukugo word and uses the on'yomi for both kanji. You learned those readings with the kanji, so you should be able to read this on your own.
遼太は怒りで顔面蒼白になった。
Ryota's face turned pale with anger.
患者は蒼白な顔をしていて、非常に弱々しく見えました。
The patient's face was pallid and he looked extremely weak.
一晩中起きていた元帥は、まるで幽霊のように蒼白な顔をして朝食の席についた。
The General, who had been awake all night, sat down to breakfast, looking as pale as a ghost.