Answer:

kingdom

AnswerCrossword Clue
KINGDOMTaxonomic division
KINGDOMRealm
KINGDOMRoyal realm
KINGDOMRegal realm
KINGDOM"... my .. for a horse!": Shak.
KINGDOMHighest taxonomic category
KINGDOMCamelot, to Arthur
KINGDOMPlants, for instance
KINGDOMSenegal neighbor
KINGDOM... come.
KINGDOMOffer made for a horse
KINGDOMEthelwulf had one: 839-58