spectroscopy (scientific study of spectra)

to investigate, to look up, to look into, to study, to examine, to check up on, to look over / (music) to play, to perform (an instrument) / (music) to tune

to use / to employ / to make use of, to apply / to spend

ingredient / (mathematics) entity

a spectrum

to divide light into a spectrum

law / measure, size

material, substance

use one thing for many purposes / work someone hard

songbun (a system of ascribed status in North Korea, based on one's political, social, and economic background and the behaviour of relatives)