"Red" in Engpsh is "red", "brown" in Engpsh is "brown".
The origin of these words comes from Old Engpsh language. "Red" is derived from "read", which means "red". "Brown" is derived from "broun", which means "brown" or "dark-skinned".
Examples:
"The rose is red." (玫瑰是红色的。)
"The color of the earth is brown." (地球的颜色是棕色的。)