Ruach is the ordinary Hebrew word for moving air, and it names wind, breath, and spirit without telling you which one is meant.
Ruach starts as a word for air in motion. It is the wind that drives back the sea, the gust that flattens a tent, the breeze at the end of a hot day. From there it stretches naturally to breath, the air that goes in and out of a living creature — so ruach can mean the difference between a corpse and a person. It stretches further still to spirit: a person's inner state (a troubled ruach, a proud ruach, a broken ruach), and God's own presence and power acting in the world.
Hebrew doesn't mark these as separate senses the way English does. The same word describes a storm over the Red Sea and the life in Adam's lungs and the force that comes on Samson before he tears a lion apart. Context tells you which is in view, not the word itself. That's the range — one term covering what English splits into three.
Now the earth was formless and void, and darkness was over the surface of the deep. And the Spirit of God was hovering over the surface of the waters.
The ruach of God hovers over the waters before creation takes shape.
But God remembered Noah and all the animals and livestock that were with him in the ark. And God sent a wind over the earth, and the waters began to subside.
God sends a ruach, an ordinary wind, to dry up the floodwaters.
Then He said to me, “Prophesy to the breath; prophesy, son of man, and tell the breath that this is what the Lord GOD says: Come from the four winds, O breath, and breathe into these slain, so that they may live!”
Ruach is called from the four winds to breathe life into the dry bones.
I have seen all the things that are done under the sun, and have found them all to be futile, a pursuit of the wind.
Human striving is called a chasing after ruach, air that cannot be caught.
English translators have to pick a lane every time: wind, breath, or spirit, and sometimes mind or temper for a person's inner state. The KJV and most modern versions render it 'spirit' when God is the subject, 'wind' for weather, and 'breath' for the body, which reads smoothly but hides the fact that the original hearer heard one word doing all three jobs at once.
People assume ruach is a technical, always-theological word, as if every occurrence points to the Holy Spirit. Most of the time it doesn't — it's just the air moving, or the breath in someone's chest. A related bad word-study leans on the fact that ruach is grammatically feminine and tries to draw theological conclusions from that; Hebrew grammatical gender doesn't carry that kind of weight.
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