遺孤[iko] orphan
孤客[kokaku] lone traveller
孤軍[kogun] lone (isolated) force
孤児院[kojiin] orphanage
孤城[kojou] solitary castle

孤島[kotou] solitary island
孤独[kodoku] isolation
孤立[koritsu] isolation
孤立化[koritsuka] isolation

高が[takaga] it's only ... (something)
意気軒高[ikikenkou] in high spirits
異常高温[ijoukouon] abnormally high temperatures
一斉高[isseidaka] all-round (market) advance
雲高[unkou] height of clouds

円高[endaka] high-valued yen
価値高い[kachitakai] valuable
可能性が高い[kanouseigatakai] very likely
勘定高い[kanjoudakai] calculating
気高い[kedakai] sublime