Synonyms for Th (same or very similar meaning)
WordNet sense 1 (the fifth day of the week; the fourth working day):
ThursdayWordNet sense 2 (a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands):
thoriumFrom the ODE community, based on WordNetadd/edit