Colours are an important part of our lives, from the clothes we wear to the flags of different countries. HUES is a four letter word for colours, referring to the variety of shades and tints that can be seen in the world around us. FLAG is also a four letter word for colours, referring to the national flags of different countries, which often feature bright and vibrant colours. DYES is another four letter word for colours, referring to the substances used to colour fabrics, clothing, and other materials.