琥珀: amber - a hard yellow to brown translucent fossil resin, used for jewellery.

博物: natural history

博士論文: doctoral dissertation

伯爵: earl, count

脅迫: to threaten / 強迫: to compel

脅迫: threat / 強迫: pressure, compulsion

clearly evident, obvious, crystal-clear

合い言葉: password; watchword; countersign

合口, 合い口: compatibility, rapport, or cooperativeness in anything done together with others / 合口, 合い口: getting along well with others, affinity

相嫁: co-sister-in-law; one's husband's brother's wife