Yellow ochre is a natural earth pigment that takes its name from the Greek word ochros, meaning "pale yellow." It is a muted, warm yellow shade that is often used in art and design, particularly in traditional painting techniques. There are several synonyms for yellow ochre, including buff, mustard, and gold. Buff is a light beige or tan hue with yellow undertones, while mustard is a tangier, deeper yellow shade that has been named after the plant's seeds. Gold is a more vibrant and metallic yellow, with warm orange undertones. All of these shades can be used interchangeably with yellow ochre in many creative projects.