The best word to describe "14k + 2" in the equation "14k + 2 = 16" is expression.
An "expression" is a combination of numbers, variables, and operations without an equality sign, whereas an "equation" includes an equality sign. "Sum" refers to a result of addition, and "term" refers to a single part of an expression or equation. In this case, "14k + 2" is an expression.
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