This is a small, ancient family with a single idea: being sent to do a task. A מַלְאָךְ is the one sent, a messenger in the Bible, an angel in later usage (an angel is simply God's emissary). The same root underlies מְלָאכָה, work / craft, the task entrusted to the sent one. The adjective מְלָאכוּתִי, artificial, is built from that "work" sense: artificial means made by human craft, not by nature. No verb is lexicalized in modern Hebrew, so the family lives entirely in its nouns and one adjective.
This root has no living verb in modern Hebrew. It survives only in nouns, above all מַלְאָךְ (messenger, angel) and מְלָאכָה (work, craft). A reminder that not every root fills the verb system.
Same root letters, different noun moulds (mishkalim). The mould tells you the function: who does it, the act of doing it, or the thing produced.
Strip the prefixes, suffixes and vowels. Three consonants remain, and the meaning lives there.