Which word does NOT belong with the others?

The heart, liver, and stomach are all organs of the body. The aorta is an artery, not an organ.

Defendant, prosecutor, and judge are all persons involved in a trial. A trial is not a person.

Evaluate, assess, and appraise are all synonyms; instruct does not mean the same thing.

Biology, chemistry, and zoology are all branches of science. Theology is the study of religion.

The scythe, knife, and saw are all cutting tools. Pliers are tools, but they are not used for cutting.

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.