Mammoth Uncensored Word List:
54 words ending with th, 6 letters long

acanth aneath breath bypath coolth daleth dearth drouth eighth eolith fourth galuth graith growth hadith health hearth highth inwith length liroth moneth oolith plinth scaith scarth scouth scowth sheath skaith skarth sleuth smeath smeeth smooth sneath sparth spilth staith stouth strath swarth toroth trowth uneath warmth wealth wraith wreath wroath zenith zeroth zibeth zizith