call back vs recognize

call back and recognize both are verbs.

Word	Noun	Adjective	Verb	Adverb
call back	No	No	Yes	No
recognize	No	No	Yes	No

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

Other hyponyms of call back include know, recognise, brush up, refresh, review.

call back (verb)	recognize (verb)
recall knowledge from memory; have a recollection	perceive to be the same
summon to return	be fully aware or cognizant of
return or repeat a telephone call	accept (someone) to be what is claimed or accept his power and authority
cause to be returned	express obligation, thanks, or gratitude for
	express greetings upon meeting someone
	detect with the senses
	grant credentials to
	show approval or appreciation of
	exhibit recognition for (an antigen or a substrate)