work done for free, unpaid work, uncompensated work / work done in vain, work with no favorable end result

to work for free, to work without pay or other compensation / to work in vain, to work with no favorable end result

(archaic, grammar) any word that declines or conjugates / (archaic, grammar) more specifically, a verb

godfather

Father's Day

(Heavenly) Father (God, the father of Creation)

(honorific) father

(honorific) father

(dialectal) Contraction of 父ちゃん (tō-chan, “daddy”).

sick father