He complimented her on the way her sweater complemented her hair. Complement and compliment, though quite distinct in meaning, are sometimes confused because they are pronounced the same. As a noun, complement means something that completes or brings to perfection (The antique silver was a complement to the beautifully set table); used as a verb it means to serve as a complement to. The noun compliment means an expression or act of courtesy or praise (They gave us a compliment on our beautifully set table), while the verb means to pay a compliment to.