Goalkeeper Megan Taylor led the way with 10 saves.
The Terps scored 25 goals for the first time in 15 years.
The Wildcats drew within two in the second half, but the Terps pulled away with a 9-0 run to close the game.
Northwestern upset the Terps in the Big Ten tournament championship on May 5. Now, a rematch looms.
Steele tallied a career-high seven goals.
Caroline Steele scored seven goals.
The Terps have had mixed results against zone defenses this year.
After falling behind 4-0, the Terps stormed back.
After trailing 4-0 early, the Terps scored eight unanswered goals to end the first half.
In their loss to Northwestern, the Terps struggled to find clear shots on goal.