Pun
Part of speech: noun
Definition: A joke or type of wordplay in which similar senses or sounds of two words or phrases, or different senses of the same word, are deliberately confused.
Part of speech: verb
Definition: To tell a pun, to make a play on words.
Example sentence: A good pun may be admitted among the smaller excellencies of lively conversation.
Paronomasia
Part of speech: noun
Definition: a pun or play on words