they go well together because they fill in each other's gaps

complementary

adjective|/ˌkɒm.plɪˈmen.tər.i/

Combining in a way that enhances or improves each other; forming a complete whole together.

Examples

In a meeting

Their complementary skill sets make them an effective team — she handles strategy, he handles execution.

Over coffee

Red wine and dark chocolate are complementary flavors.

Why this word

additional

Complementary implies two things complete each other or fill gaps, while additional merely means more of something

matching

Complementary suggests functional completion where elements enhance each other, while matching focuses on similarity or coordination

supplementary

Complementary means mutually completing to form a whole, while supplementary means adding to improve or extend something already adequate

Usage tip

Not the same as 'complimentary' (which means free or flattering). Complementary means two things complete each other.

Etymology

Latin complementum — com (together) + plere (to fill), literally 'filling up together'

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