What is a complementary color scheme

Complementary is a color scheme using one base color and its complement, the color on the exact opposite side of the color wheel. The base color is main and dominant, while the complementary color is used only as an accent. A combination of one warm and one cold color is always created.

Complementary is a color scheme using one base color and its complement, the color on the exact opposite side of the color wheel. The base color is main and dominant, while the complementary color is used only as an accent. A combination of one warm and one cold color is always created. We have to consider, which one will be dominant, and which one one accenting. The choice decides whether the result palette will look warm, or cold. Various monochromatic shades of both colors could be added to the scheme.

Explanation:

Hope.this helps and that's what google says

your word would be isle.

isle is an island or peninsula especially a small one.

if you add the letter "a" you get aisle, which is a passage between 2 rows of something like chairs, shelves, or something else.