Seven Wonders of the World vs plural

Seven Wonders of the World and plural both are nouns.

Word	Noun	Adjective	Verb	Adverb
Seven Wonders of the World	Yes	No	No	No
plural	Yes	Yes	No	No

Seven Wonders of the World (noun)	plural (noun)
impressive monuments created in the ancient world that were regarded with awe	the form of a word that is used to denote more than one

Seven Wonders of the World (adjective)	plural (adjective)
	grammatical number category referring to two or more items or units
	composed of more than one member, set, or kind