The word "寓居" is formed by combining the character "寓", which uses the radical "宀" for roof or dwelling along with the phonetic component "禺" to signify lodging or temporary residence, with the character "居", which incorporates the radical "尸" often related to a person and the component "古" to denote living or dwelling; together, they create a compound where both characters contribute semantically to express the act of residing in a place that is not one's permanent home.