侯国[koukoku] principality
侯爵[koushaku] marquis
侯爵夫人[koushakufujin] marchioness
侯伯[kouhaku] nobles
公侯[koukou] princes and marquises

三百諸侯[sanbyakushokou] all the daimyos
諸侯[shokou] princes
王侯[oukou] king and princes
藩侯[hankou] feudal lord

ハチ公[hachikou] statue of Hachiko (a dog) at Shibuya station
郭公[kakkou] common cuckoo (Cuculus canorus)
株式公開[kabushikikoukai] stock offering (to the public)
蒲公英[tanpopo] dandelion (esp. species Taraxacum platycarpum)
官公庁[kankouchou] government administration office

丸公[marukou] official price
勤め奉公[tsutomeboukou] apprenticeship
公平[kinpira] chopped burdock root (and sometimes carrot) cooked in sugar and soy sauce
公孫樹[kousonju] ginkgo (Ginkgo biloba)