The collective noun harem is used for a harem of seals, a harem
of sea lions, a harem of mares, a harem of mules.
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The harem keeper is the Sultan. In this regard he could be considered the head of the harem. The harem guards are eunuchs. An odalisque is a harem slave.
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The noun 'harem' is a standard collective noun for a harem of
seals.