the Berasit Hebrew Dictionary

מלאכ Melak is usually translated as work. (see Genesis 2:2-3) (as Strongnumber 4399)

However, in Genesis 1:7, another word “ashi” is also used to indicate work.

Then there are a lot of cases where melak is translated as “angels” (Strongnumber 4397)

There is possibility that melak actually means a technology of some sort. In Psalm 91:11, the Melak is commanded to protect David (see also Psalm 34:7)