一翼[ichiyoku] (a) part
右翼[uyoku] right-wing (politics)
右翼団体[uyokudantai] right-wing organization (clique) (organisation)
羽翼[uyoku] wings and feathers
下げ翼[sageyoku] wing flap

左翼[sayoku] left-wing
主翼[shuyoku] main wings (of an aeroplane, airplane)
小心翼翼[shoushinyokuyoku] very timid
上翼[jouyoku] upper wing of a plane
全翼飛行機[zenyokuhikouki] flying wing

異類[irui] varieties
一類[ichirui] same kind
円虫類[enchuurui] round worms
塩類[enrui] salts
塩類溶液[enruiyoueki] saline

貝類[kairui] shellfish
柑橘類[kankitsurui] citrus fruits
希土類[kidorui] rare earth
魚貝類[gyokairui] marine products
魚類[gyorui] fish

弁鰓類[bensairui] lamellibranches (i.e. bivalves)
鰓呼吸[erakokyuu] branchial respiration (breathing using gills)
鰓蓋[erabuta] gill cover
鰓孔[eraana] gill slit
鰓裂[sairetsu] gill slit

腸鰓類[chousairui] enteropneusts (hemichordates of class Enteropneusta)
翼鰓類[yokusairui] pterobranchs (hemichordates of class Pterobranchia)
海鰓[umiera] sea pen (any coelenterate of the family Pennatulidae or related families)
板鰓類[bansairui] elasmobranchs