The suffix for the word "excel" is "-ent" when referring to a person who excels or is excellent at something.
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The suffix word of "constitutional" is "tion," which forms the word "constitution."
The suffix of the word "magician" is -ian.
The suffix of the word "customary" is "-ary."
The suffix in the word duties is -ies. This suffix just makes words plural.
The suffix in the word darkness is -ness.