き.く 
() profit () benefit
                     
(n) advantage, benefit, profit, interest
きかせる (v1,vt) to be seasoned, to be enlivened
ききめ (n) effect, virtue, efficacy, impression
きく (v5k,vi) (1) to be effective, to show effect, (2) to do its work, to carry out its function well, (3) to be possible to use
りえき (n,vs) (1) profit, gains, (2) benefit, advantage, interest (of the public, etc.)
りさげ (n,vs) decrease in interest rates
りまわり (n) interest, (investment) yield, profits
りがい (n) advantages and disadvantages, interest
りがいかんけい (n) interests, stake
りけん (n) interest, rights, concession
りこ (n) self-interest
りこしゅぎ (n,adj-no) egoism, selfishness
りこう (adj-na,n) clever, shrewd, bright, sharp, wise, intelligent
りし (n) interest (bank)
りじゅん (n) profit, returns
りあげ (n,vs) increase in interest rates
りしょく (n,vs,adj-no) money-making
りそく (n) interest (bank)
りてん (n) advantage, point in favor, point in favour
りばらい (n) interest payment
りべん (adj-na,n) convenience
りよう (n,vs) use, utilization, utilisation, application
りようしゃ (n) user, end-user, consumer
りりつ (n) interest rate

Links: KanjiDic: EDict : Wikimedia
Etymologies: 中文字譜 : 説文解字