Nightingale
Part of speech: noun
Definition: A European singing bird, Luscinia megarhynchos in the family Turdidae.
Mockingbird
Part of speech: noun
Definition: A long-tailed American songbird of the Mimidae family, noted for its ability to mimic calls of other birds.
Example sentence: I grew up in a courtroom kind of like the one you saw in 'To Kill a Mockingbird' - big, big courtroom, sometimes it didn't even have air conditioning.