悪循環[akujunkan] vicious circle
因循[injun] indecision
因循姑息[injunkosoku] dilly-dallying and temporizing (temporising)
血液循環[ketsuekijunkan] blood circulation
再循環[saijunkan] recycle

循環[junkan] circulation
循良[junryou] good and obedient
循環小数[junkanshousuu] recurring decimal
循環系[junkankei] circulatory system (blood, lymph, etc.)
循環器[junkanki] circulatory organ

悪循環[akujunkan] vicious circle
一環[ikkan] link (e.g. a part of a larger plan)
印環[inkan] signet ring (in medical contexts, e.g. signet ring cell)
円環[enkan] circle
花環[hanawa] wreath

環境[kankyou] environment
環境グループ[kankyouguruupu] environmental group
環境事業[kankyoujigyou] environmental business
環境庁[kankyouchou] Environment Agency
環境庁長官[kankyouchouchoukan] Director General of Environment Agency

肺炎[haien] pneumonia
肺活量[haikatsuryou] lung capacity
肺肝[haikan] lungs and livers
肺結核[haikekkaku] pulmonary tuberculosis
肺臓[haizou] lungs

肺病[haibyou] lung disease
肺胞[haihou] pulmonary alveolus
肺葉[haiyou] pulmonary lobe
肺ガン[haigan] lung cancer