双節棍[nunchaku] nunchaku (two linked fighting sticks)
一双[issou] pair (esp. of folding screens)
一卵性双生児[ichiranseisouseiji] identical twins
双紙[soushi] written work (esp. a bound text, as opposed to a scroll)
自己双対[jikosoutsui] self dual

双刃[moroha] double-edged
双暗車[souansha] twin propellers
双殻類[soukakurui] bivalves
双眼[sougan] both eyes

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