* Noun: "Complementary" as a noun refers to something that completes or enhances something else. For example: "The wine and cheese are a perfect complementary."
* Adjective: "Complementary" as an adjective describes something that completes or enhances something else. For example: "The colors in the painting are complementary."
It's important to note that "complement" is a verb. So, you could say: "The red scarf complements her outfit."