Words the Bible translates as concubines

English uses one word here. The Bible uses 2 words, and they do not mean the same thing. Each is listed with what it actually means, most frequent first.

shiddahשִׁדָּהthe last item in a king's list of everything he collected for his own pleasure, and a word whose meaning is genuinely lost: most likely chests of treasure, possibly women of a harem.
daḥavahדַּחֲוָהthe evening comforts a king would have had carried in to him: the exact sense is lost, and food, music, entertainment, and the women of the court have all been proposed

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Every English meaning beginning with C is on its letter page, and the whole index starts at Browse.