Honestly I don't have a really good one.
"Warlord" "Officer" "Captain" "Marshall" are all categorically different from "Fighter" "Ranger", etc. They imply rank not profession, and especially connote command and giving orders.
"Tactician" "Strategist" and the like are kind of boring. Like calling Wizards "Casters". Plus they just sound like modern words, whatever the etymology is. (Anybody for "Compleat Strategist"?)
So I don't know what the answer is. It's a tough one. Perhaps partly because the archetype from history, fiction, and myth doesn't exist as a profession: nobody starts as a Warlord. There's no such thing as an apprentice Warlord. It's something you become. That and it's an amalgam of concepts. I.e. giving spur of the moment tactical advantage is not a Marshall/Warlord thing, it's a...well, I don't really know.
Maybe we should just call it "Warlord" and always include the quotes. When speaking we can use air quotes.