Gravel
Part of speech: verb
Definition: To apply a layer of gravel to the surface of a road, etc. To puzzle or annoy
Part of speech: noun
Definition: Small fragments of rock, used for laying on the beds of roads and railroads, and as ballast. A type or grade of small rocks, differentiated by mineral type, size range, or other characteristics.
Example sentence: The Prius does about 55mpg and it always amuses me. I love it when you pull up at someone's house and all you can hear is the gravel crunching under the tyres. I don't have to pay the central London congestion charge, either.
Puzzle
Part of speech: verb
Definition: To perplex (someone).
Part of speech: noun
Definition: Anything that is difficult to understand or make sense of.A game for one person that is more or less difficult to work out or complete.A crossword puzzle.A jigsaw puzzle.A riddle.
Example sentence: Each person is an enigma. You're a puzzle not only to yourself but also to everyone else, and the great mystery of our time is how we penetrate this puzzle.