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Both sides looked lively at the start of the second half, but it was Ipswich who made the most of their chances, as Wordsworth volleyed the ball in after Nouble's cross was deflected into the box.
The miss proved costly as the hosts took the lead again just two minutes later when Gabriele Angella was left unmarked in the box for a free header.
Watford added a third just moments later when Daniel Tozser beat several defenders before setting up Lewis McGugan, who powered it home from close range.
McGugan had a chance to claim his second shortly after, but he fired it just over from the edge of the box.
Ipswich continued to apply pressure late on, but they were unable to get themselves back into the match in the final minutes.
The result moves Watford up to 12th in the table, while Ipswich sit eighth, a point outside the playoff places.