Seven Wonders of the Ancient World vs plural form

Seven Wonders of the Ancient World and plural form both are nouns.

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

Seven Wonders of the Ancient World (noun)	plural form (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