Posting a mammoth 310 runs for the loss six wickets, West Indies bowlers bowled out Pakistan for 160 runs.
Jerome Taylor and Andre Russell bowled brilliantly to take three wickets each as they destroyed the Pakistani batting line-up.
Sulieman Benn scalped two wickets.
Pakistan never looked comfortable while chasing the total and kept losing wickets at regular intervals, Sohaib Maqsood (50) and Umar Akmal (59)added 80 runs in the sixth wicket partnership to delay the defeat.
West Indies had registered a massive defeat in the first match where Ireland beat them to record the first mishap of the ongoing World Cup.
Earlier, riding on Darren Bravo (49), Lendl Simmons (50) and Denesh Ramdin (51), West Indies posted 310 runs on the scorecard.
Andre Russell contributed with his willow too as he hammered a 17-ball 42. He smashed three boundaries and four sixes in his knock.
Haris Sohail took two wickets for Pakistan.
Pakistan lost their second match on a row as the Asian side was defeated by India on Sunday.
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