Rappers and poets take note: Most people have heard there are no words that rhyme with "orange." But according to Dictionary.com, there are 19 words in the English language that have no perfect rhyme.

Related Fact: The words are angst, bulb, cusp, film, gulf, kiln, oblige, opus, orange, pint, plankton, rhythm, silver, yttrium, depth, breadth, width, month and glimpsed. Can you think of any they missed? Or can you find a perfect rhyme for one of these 19?

[Source: Dictionary. See previous Numbers of the Day here. ]