While they asserted that it had been "the nicest party they’d ever seen—my! so clever and original," she smiled tremendously, shook hands, and cried many suitable things regarding children, and being sure to wrap up warmly, and Raymie’s singing and Juanita Haydock’s prowess at games.
There are no more uses of "prowess" in the book.
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Their defensive prowess helped them win the Super Bowl.
They soon began to boast of their respective superiority to each other in strength and prowess.