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)

パイプ役[paipuyaku] mediator
悪役[akuyaku] villain
一役[ichiyaku] an office
一役[hitoyaku] role (which someone or something plays in a given situation)
下役[shitayaku] underling

仮役[kariyaku] temporary post
加役[kayaku] temporary extra work
監査役[kansayaku] auditor
顔役[kaoyaku] influential man
区役所[kuyakusho] ward office