御古[ofuru] used article (esp. clothes)
手古摺る[tekozuru] to have much trouble
土耳古[toruko] Turkey
下稽古[shitageiko] rehearsal
懐古[kaiko] recalling the old days

擬古[giko] imitation of classical styles
擬古文[gikobun] classical style
稽古[keiko] practice
遠古登点[wokototen] marks to aid in reading Chinese classics
古え[inishie] antiquity

稀元素[kigenso] rare element
稀釈[kishaku] dilution
稀少価値[kishoukachi] scarcity value
稀硫酸[kiryuusan] dilute sulfuric acid
稀少[kishou] scarce

稀世[kisei] rare
稀書[kisho] rare book
稀薄[kihaku] thin (e.g. air)
古稀[koki] 70th birthday