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

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

Area, circumference, and quadrilateral are all terms used in the study of geometry. Variable is a term generally used in the study of algebra.

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

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