Synonyms of the word

complementary

• adj. Acting as a complement.
• adj. (genetics) Of the specific pairings of the bases in DNA and RNA.
• adj. (physics) Pertaining to pairs of properties in quantum mechanics that are inversely related to each other,…
• n. A complementary colour.
• n. (obsolete) One skilled in compliments.

additive

• adj. (mathematics) Pertaining to addition; that can be, or has been, added.
• adj. (mathematics, of a function, etc.) Distributive over addition.
• adj. (algebra) Having addition as an operator.
• adj. (chemistry) Pertaining to chemical addition.
• adj. (genetics) Describing genes (or the interaction etc. of such genes) which govern the same trait and whose…
• n. A substance added to another substance or product for its ability to alter its properties.
• n. (grammar) A word or phrase that adds something, such as also, even, or nor.

antonymous

• adj. having an opposite or diametrically opposed meaning.
• adj. of, or being an antonym; antonymic.

complemental

• adj. Of the nature of a complement; completing.
• adj. Complementary.
• adj. (obsolete) Additional; supplemental, accessory; ancillary.
• adj. (obsolete) Of the nature of a ceremony that is not essential but accessory; ceremonial; ceremonious; formal.
• adj. (obsolete) Of persons: accomplished; talented; experienced.
• adj. (obsolete) Complimentary.

completing

• v. present participle of complete.