teen, teens, thirteen, fourteen, fifteen, sixteen, seventeen, nineteen, umpteen

fourteenth

billionth, fourth, fifth, sixth, seventh

truth, berth, dearth, growth, health, illth, length, mirth, ruth

allotheism, ditheism, egotheism, henotheism, kathenotheism, monotheism, pantheism

action

episiotomy, lithotomy, lobotomy, necrotomy, tracheotomy

dominatrix, executrix

positron, cyclotron, ignitron

allotrope

dystrophy, heterotrophy, hypertrophy, oligotrophy, atrophy, trophic

finitude, magnitude, multitude, negritude

eighty, fifty, forty, ninety, thirty, twenty

safety, surety, propensity, uncertainty