Eye

안과 = The department of ophthalmology (hospital)
안경 = Glasses
안구 = Eyeball

Safe, comfortable

안전하다 = safe
안전선 = safety line (subway)
보안 = the preservation of public peace
편안(하다) = comfortable
안녕 = peace, stability
불안하다 = uneasy, insecurity, nervous

미안(하다) = sorry
안락사 = euthanasia