This is the 9196th most frequent Korean word.
건설사
Construction company.
Here, '건설사' is used to refer to a business entity specializing in construction.
이 건설사는 철근 콘크리트 구조를 전문으로 합니다.
This construction company specializes in reinforced concrete structures.
In this sentence, '건설사' represents the workplace, referring to a construction company.
저는 건설사에서 근무하며 프로젝트 관리를 맡고 있어요.
I work at a construction company and am in charge of project management.
Here, '건설사' is used in a plural form to talk about entities participating in community development.