πνεῦμα when used in its lower meaning to denote wind means simply an ordinary wind, a regularly blowing current of air of considerable force. πνοή is distinguished from it as being a gentler motion of the air. ἄνεμος, on the other hand, is more forcible than πνεῦμα, it is the strong, often the tempestuous, wind. λαῖλαψ is the violent fitful wind which accompanies a heavy shower. θύελλα is more violent than any of the others, and often implies a conflict of opposing winds.