The ancient character of "云" resembled cloud in the air with cloud layer above and cloud cluster below. Later,"云" was expressed by the meaning of "say", so the character of "雨", which was used to distinguish the meanings, was added on the upper part of "云"to express the original meaning "cloud". Now "云" is still used to be a simplified character.
字义:
cloud
组词:
云彩: yúncǎi/cloud
白云:báiyún/ white cloud
云雾 :yúnwù/cloud and mist
云消雾散:yún xiāo wù sàn/the clouds melt and the mists disperse. i.e. vanish in the air