C major vs C major scale

C major and C major scale both are nouns.

Word	Noun	Adjective	Verb	Adverb
C major	Yes	No	No	No
C major scale	Yes	No	No	No

As nouns, C major and C major scale are synonyms defined as:

C major and C major scale: (music) the major scale having no sharps or flats

Other synonyms of C major include scale of C major.

C major (noun)	C major scale (noun)
(music) the major scale having no sharps or flats	(music) the major scale having no sharps or flats