loyalty vs devotion

loyalty and devotion both are nouns.

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

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

loyalty: the act of binding yourself (intellectually or emotionally) to a course of action
devotion: commitment to some purpose

Other hyponyms of loyalty include communalism, consecration, enlistment, faith.

loyalty (noun)	devotion (noun)
the act of binding yourself (intellectually or emotionally) to a course of action	(usually plural) religious observance or prayers (usually spoken silently)
the quality of being loyal	commitment to some purpose
feelings of allegiance	religious zeal; the willingness to serve God
	feelings of ardent love