majority vs relative quantity

majority and relative quantity both are nouns.

Word	Noun	Adjective	Verb	Adverb
majority	Yes	No	No	No
relative quantity	Yes	No	No	No

As nouns, relative quantity is a hypernym of majority; that is, relative quantity is a word with a broader meaning than majority:

majority (noun)	relative quantity (noun)
the property resulting from being or relating to the greater in number of two parts; the main part	a quantity relative to some purpose
(elections) more than half of the votes
the age at which persons are considered competent to manage their own affairs