The meaning of “ἔργον”

“All therefore whatsoever they bid you observe, that observe and do; but do not ye after their works: for they say, and do not.”

“Even as David also describeth the blessedness of the man, unto whom God imputeth righteousness without works,”

“But if I live in the flesh, this is the fruit of my labour: yet what I shall choose I wot not.”

“But watch thou in all things, endure afflictions, do the work of an evangelist, make full proof of thy ministry.”

“But the day of the Lord will come as a thief in the night; in the which the heavens shall pass away with a great noise, and the elements shall melt with fervent heat, the earth also and the works that are therein shall be burned up.”