verb vs major form class

verb and major form class both are nouns.

Word	Noun	Adjective	Verb	Adverb
verb	Yes	No	No	No
major form class	Yes	No	No	No

As nouns, major form class is a hypernym of verb; that is, major form class is a word with a broader meaning than verb:

verb (noun)	major form class (noun)
a content word that denotes an action, occurrence, or state of existence	any of the major parts of speech of traditional grammar
the word class that serves as the predicate of a sentence