This is the 8067th most frequent Japanese word.
完工
Completion of construction.
The word '完工' is used as a noun referring to the completion or finishing of a project.
このプロジェクトの完工が待ち遠しいです。
I can't wait for the completion of this project.
Here, '完工日' incorporates '完工' to form a compound noun meaning 'completion date'.
建物の完工日が正式に発表された。
The completion date of the building has been officially announced.
In this sentence, '完工' operates as a participle describing the state of the bridge being recently completed.