0 Old HSK word(s):
义务工* *

Definitions from Unihan Copyright © 1991-2015 Unicode® Inc. All rights reserved.

义 right conduct, righteousness
务 affairs, business / must, should
工 labor, work / worker, laborer

Hsk Characters:
HSK -Characters and beyond:
GbBig5EngRadMegaTripleMultilingual