The difference between Sand pillar and Willy willy
When used as nouns, sand pillar means a dust devil, whereas willy willy means a dust devil.
check bellow for the other definitions of Sand pillar and Willy willy
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Sand pillar as a noun (meteorology):
A dust devil; a whirling, columnar vortex of sand occasionally seen in desert regions.
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Willy willy as a noun (Australia):
A dust devil; a tornado
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Willy willy as a noun (now rare):
A tropical cyclone in Australia.