sermonize vs advocate

sermonize is not a noun while advocate is a noun.

Word	Noun	Adjective	Verb	Adverb
sermonize	No	No	Yes	No
advocate	Yes	No	Yes	No

As verbs, advocate is a hypernym of sermonize; that is, advocate is a word with a broader meaning than sermonize:

Other hypernyms of sermonize include preach.

sermonize (noun)	advocate (noun)
	a person who pleads for a cause or propounds an idea
	a lawyer who pleads cases in court

sermonize (verb)	advocate (verb)
speak as if delivering a sermon; express moral judgements	push for something
	speak, plead, or argue in favor of