Ellyse Perry was the early destroyer in Wellington, taking two wickets in her first over to finish with 3-22.
Allrounder Ash Gardner then joined in with 3-25, including the crucial dismissal of West Indies captain Stafanie Taylor.
Just two days after Meg Lanning's side crushed New Zealand by 141 runs at the same venue, Australia started in similarly dominant style.
With Darcie Brown — the White Ferns' chief irritant — rested, Lanning instead elected to use Perry with the wind in Wellington.
Perry started waywardly with a pair of wides before a beautifully pitched and swinging delivery bowled Hayley Matthews, crashing into the top of her off-stump.
When Perry had Kycia Knight caught behind the next ball, she had the chance to claim the third hat-trick in Women's World Cup history.
She got it all wrong, giving Taylor a full toss to swat for three.
However, Perry kept storming in from the scoreboard end and claimed the wicket of the dangerous Deandra Dottin for 16, in a marathon eight-over stint.
While world No.1 ranked ODI bowler Jess Jonassen was restored to the side, along with Annabel Sutherland for Brown and Amanda-Jade Wellington, allrounder Gardner did the damage through the middle order.
Gardner tempted Shemaine Campbelle into a rash shot and then bowled Chedean Nation to leave the Windies 5-70.
An unfortunate run out didn't help the Windies, who had no partnerships of note.
Taylor, who entered in the second over, lost partner after partner on her way to 50 before Gardner trapped her in front in the 41st over.
Jonassen (2-18) took the last two wickets.
With three wins over England, Pakistan and New Zealand already in the bag this tournament, Australia will be heavily favoured to score the 132 runs needed for victory.
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