a word that is very long or hard to pronounce.
Not only is this jawbreaker incredibly long and weird looking, it has many parts-of-speech in one word!
a large, hard, spherical candy.
If you don't know what jawbreakers are, let us enlighten you. These hard, round, ball-shaped candies are often mistaken for gumballs. Trouble is, they are so hard to bite into that you risk "breaking your jaw".