The Chinese word "坟墓" is formed by combining two characters, "坟" and "墓", each of which independently refers to a burial site or grave, with both containing the radical "土" (earth) to visually emphasize their connection to the ground and interment. This pairing creates a compound word where the similar meanings reinforce and specify the concept of a tomb, reflecting a common Chinese linguistic practice of using synonymous or closely related characters to convey a unified, concrete idea.