content word vs verb

content word and verb both are nouns.

Word	Noun	Adjective	Verb	Adverb
content word	Yes	No	No	No
verb	Yes	No	No	No

As nouns, verb is a hyponym of content word; that is, verb is a word with a more specific, narrower meaning than content word:

content word: a word to which an independent meaning can be assigned
verb: a content word that denotes an action, occurrence, or state of existence

Other hyponyms of content word include head word, headword, noun, modifier, qualifier, numeral.

content word (noun)	verb (noun)
a word to which an independent meaning can be assigned	a content word that denotes an action, occurrence, or state of existence
	the word class that serves as the predicate of a sentence