scummer

"Both paper and plastic can be recycled."

"The dog's excrement was left on the sidewalk, requiring the owner to clean it up. "

"The printing press operator cleaned the plate carefully to remove the scumming before starting the next run. "

"The violinist was a master of her instrument."

"He removed the marbles from the bag."

"Even animals in the Jewish system cause impurity only when they are dead."

"He listened carefully to his mother's concerns, feeling sorrowful about her disappointment. "

"The responsible for the project is Maria. "

"My neighbour has two noisy cats."

"The soup simmered on the stove."

"They were lifelong friends; they met in elementary school and ended their lives in the same rest home."

"My sister is a strong supporter of my dreams to become a doctor. "