graduate school (of); graduate course; postgraduate program
Refers to a division within a university's graduate school, such as the Graduate School of Engineering. Often used in official names like 工学研究科.
He went on to the Graduate School of Engineering at the University of Tokyo.
This graduate school has both master's and doctoral programs.
学部 is an undergraduate faculty or department, whereas 研究科 is its graduate-level counterpart.
graduate school of science
Compound of 研究 (research) and 科 (department, course). The term is a modern academic coinage.