Rouge, also known as blusher, is a cosmetic applied to the cheeks to impart a healthy color and create a fresh, lively look.
Foundation is employed to achieve a uniform skin tone, serving as a makeup base.
Shimmer, a highlighter, provides a glow but differs from blusher.
Primer primes the skin for makeup by smoothing it; it does not add color to the cheeks.
Therefore, Rouge is the accurate term, being synonymous with blusher.