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

愛しい[itoshii] lovely
愛子[manago] beloved child
愛すべき[aisubeki] lovable
愛する[aisuru] to love
愛でたし[medetashi] wonderful

愛でる[mederu] to love
愛に飢える[ainiueru] to hunger for love
愛の結晶[ainokesshou] fruit of love
愛らしい[airashii] pretty