Mock"er (?), n.
1.
One who, or that which, mocks; a scorner; a scoffer; a derider.
2.
A deceiver; an impostor.
3. Zool.
A mocking bird.
Mocker nut Bot., a kind of hickory (Carya tomentosa) and its fruit, which is far inferior to the true shagbark hickory nut.
© Webster 1913.