The word "拥挤" is formed by combining the character "拥", which itself consists of the hand radical "扌" and the component "用" to suggest gathering or holding, with the character "挤", composed of the same hand radical "扌" and the component "齐" to imply pressing or squeezing together; semantically, both characters contribute actions related to compactness and pressure, resulting in the combined meaning of crowdedness or congestion.