The antique dresser was topped with a brass knop that caught the morning light.

She admired the knopped walking stick displayed in the museum.

The tailor inspected the antique coat's knops before listing it for auction.

The linguist circled the knopperns in the manuscript to mark the word's plural.

The tanner collected knoppern from the oak grove, knowing their tannin-rich galls would produce a deep dye.

Knopf accepted the award on behalf of the entire research team.

Knopp declined the offer politely, explaining that family commitments would keep him in Germany.

The Knopps visited the old lighthouse every summer to tell stories.

The ecologist photographed a cluster of knopper galls to document the gall wasp's life cycle.

The ancient pedunculate oaks in the meadow were dotted with knopper galls, each a small, wart-like growth induced by the wasp Andricus quercuscalicis.