hold back vs baffle

hold back is not a noun while baffle is a noun.

Word	Noun	Adjective	Verb	Adverb
hold back	No	No	Yes	No
baffle	Yes	No	Yes	No

As verbs, baffle is a hyponym of hold back; that is, baffle is a word with a more specific, narrower meaning than hold back:

hold back (noun)	baffle (noun)
	a flat plate that controls or directs the flow of fluid or energy

hold back (verb)	baffle (verb)
prevent the action or expression of	restrain the emission of (sound, fluid, etc.)
hold back, as of a danger or an enemy; check the expansion or influence of	be a mystery or bewildering to
hold back; keep from being perceived by others	hinder or prevent (the efforts, plans, or desires) of
secure and keep for possible future use or application
wait before acting
refrain from doing