extol vs hymn

extol is not a noun while hymn is a noun.

Word	Noun	Adjective	Verb	Adverb
extol	No	No	Yes	No
hymn	Yes	No	Yes	No

As verbs, hymn is a hyponym of extol; that is, hymn is a word with a more specific, narrower meaning than extol:

Other hyponyms of extol include canonise, canonize, ensky, crack up.

extol (noun)	hymn (noun)
	a song of praise (to God or to a saint or to a nation)

extol (verb)	hymn (verb)
praise, glorify, or honor	praise by singing a hymn
	sing a hymn