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

肩を竦める[katawosukumeru] to shrug one's shoulders
肩を持つ[katawomotsu] to side with
肩寄せる[katayoseru] to be (standing) together, an arm across the other's shoulder
肩こり[katakori] stiff shoulders
肩巾[hire] shawl (on shoulder of woman's dress)

肩車[kataguruma] riding piggyback
肩章[kenshou] shoulder strap
肩身[katami] shoulders
肩身が狭い[katamigasemai] feeling ashamed