Solution: Flourish, prosper, and thrive are all synonyms; excite does not mean the same thing.

Solution: Seat, rung, and leg are all parts of a chair. Not all chairs have cushions.

Solution: The lobster, crab, and shrimp are all types of crustaceans; an eel is a fish.

Solution: Two, six, and eight are all even numbers; three is an odd number.