The difference between Kingdom and Regnum
When used as nouns, kingdom means a realm having a king and/or queen as its actual or nominal sovereign, whereas regnum means a rank in the classification of organisms.
check bellow for the other definitions of Kingdom and Regnum
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Kingdom as a noun:
A realm having a king and/or queen as its actual or nominal sovereign.
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Kingdom as a noun:
A realm, region, or conceptual space where something is dominant.
Examples:
"the kingdom of thought"
"the kingdom of the dead"
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Kingdom as a noun (taxonomy):
A rank in the classification of organisms, below domain and above phylum; a taxon at that rank (e.g. the plant kingdom, the animal kingdom).
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Regnum as a noun (biology, taxonomy):
A rank in the classification of organisms.
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Regnum as a noun:
A badge of royalty, especially the early form of the pope's tiara.