愛妻[aisai] beloved wife
悪妻[akusai] bad wife
一妻多夫[issaitafu] polyandry
一夫多妻[ipputasai] polygamy
稲妻[inazuma] (flash of) lightning

求妻広告[kyuusaikoukoku] advertisement for a wife
旧妻[kyuusai] former wife
恐妻家[kyousaika] hen-pecked husband
恐妻病[kyousaibyou] wife-phobia
愚妻[gusai] wife

愛妾[aishou] beloved concubine
妾腹[shoufuku] illegitimate (e.g. born to a mistress)
妻妾[saishou] one's wife and mistress(es)
男妾[danshou] male paramour
妾出[shoushutsu] illegitimate (e.g. born to a mistress)

妾宅[shoutaku] house in which a mistress is kept
蓄妾[chikushou] keeping a mistress (concubine)
外妾[gaishou] foreigner's mistress
洋妾[youshou] Westerner's mistress