hold back vs conceal

hold back and conceal both are verbs.

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

As verbs, hold back and conceal are synonyms defined as:

Other synonyms of hold back include hold in.

hold back (verb)	conceal (verb)
prevent the action or expression of	hold back; keep from being perceived by others
hold back, as of a danger or an enemy; check the expansion or influence of	prevent from being seen or discovered
hold back; keep from being perceived by others
secure and keep for possible future use or application
wait before acting
refrain from doing