"Capital" as a noun can mean either the seat of government or wealth and resources. As an adjective it means first or excellent. Sometimes it is used to mean punishable by death (a capital offense). Example: Cheyenne is the capital of Wyoming.
"Capitol" is a noun meaning the building in which a state legislature convenes; a statehouse. Example: The Wyoming capitol building is in Cheyenne. Also in referring to the official building of the U.S. Congress in Washington D.C., the word is capitalized as part of the proper noun: Capitol Building.
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