a subordinate clause that functions as a noun within a main clause.
USA: Noun or Adjective?
USA is an abbreviation for the United States of America. US tends to be the more popular way to abbreviate United States. Both of these abbreviations can serve as either adjectives or nouns. However, some style guides prefer United States as the noun form and US as the adjective form. USA USA is a noun because United States of America is a noun. A noun …
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019