give - give/gift/giver

speak - speaker

know - knowledge

enter - entry

operator - operate

informal - informality

invite - invitation

decided - decision

win - winning

live - life

widen - widened / wide

care - care (n.) - careful /careless (adj.) - carefully/carelessly (adv.)

thank - thankful

use - useful ( adj.) - usefully

youth - young

save - save / saving

sharpen - sharpening

true - truth

dead - death ( n.) - die (v.)

happy - happiness

cloud - cloudy

danger - dangerous

fun - funny