Statistics for Words that End in X

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Definition	Word	% Correct
Opposite of prefix	Suffix	90%
Opposite of concave	Convex	86%
Coitus	Sex	84%
To cast a spell upon	Hex	81%
Levy owed to the government	Tax	81%
Human organ with no known function	Appendix	76%
Opposite of wane	Wax	75%
Depiction of Jesus's cross	Crucifix	72%
Suitable for either gender	Unisex	72%
Shape of a spiral staircase or strand of DNA	Helix	71%
Variety of medium-sized wild cat	Lynx	71%
House divided into two apartments	Duplex	66%
The tailbone	Coccyx	59%
One of three divisions of an insect body	Thorax	53%
Has the head of a man and the body of a lion	Sphinx	51%
Natural rubber product	Latex	49%
Outer layer of the cerebrum	Cortex	47%
Where two lines meet in a polygon	Vertex	38%
Conforming to traditional religious doctrine	Orthodox	35%
Mixture of fat and flour	Roux	29%