major scale vs major diatonic scale

major scale and major diatonic scale both are nouns.

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

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

major scale and major diatonic scale: a diatonic scale with notes separated by whole tones except for the 3rd and 4th and 7th and 8th

major scale (noun)	major diatonic scale (noun)
a diatonic scale with notes separated by whole tones except for the 3rd and 4th and 7th and 8th	a diatonic scale with notes separated by whole tones except for the 3rd and 4th and 7th and 8th