ろうこで始まる言葉

ろうこう【老巧】

⇒ろうれん（老練）老巧な外交官an experienced diplomat彼は老巧な人だHe is a veteran.／He is an old hand at it.

ろうこつ【老骨】

老骨にむち打って働くwork in spite of one's advanced age／push [drive] one's old bones hard