novena vs devotion

novena and devotion both are nouns.

Word	Noun	Adjective	Verb	Adverb
novena	Yes	No	No	No
devotion	Yes	No	No	No

As nouns, devotion is a hypernym of novena; that is, devotion is a word with a broader meaning than novena:

novena: a Roman Catholic devotion consisting of prayers on nine consecutive days
devotion: (usually plural) religious observance or prayers (usually spoken silently)

novena (noun)	devotion (noun)
a Roman Catholic devotion consisting of prayers on nine consecutive days	(usually plural) religious observance or prayers (usually spoken silently)
	commitment to some purpose
	religious zeal; the willingness to serve God
	feelings of ardent love