烏有 is read as うゆう (uyuu) and means nonexistence.
うゆう
uyuu
うゆうせんせい
fictitious person
うゆうにきす
to be burned to ashes
うゆうにきする
to be reduced to ashes
からす
crow (Corvus spp.)
えぼし
eboshi
しょゆう
one's possessions
こゆう
characteristic
きょうゆう
sharing (files, devices on a network, posts on social media, etc.)
こくゆう
national ownership
とくゆう
characteristic (of)
せんゆう
possession
ほゆう