concentrate vs recall

concentrate and recall both are nouns.

Word	Noun	Adjective	Verb	Adverb
concentrate	Yes	No	Yes	No
recall	Yes	No	Yes	No

As verbs, recall is a hyponym of concentrate; that is, recall is a word with a more specific, narrower meaning than concentrate:

concentrate: direct one's attention on something
recall: cause one's (or someone else's) thoughts or attention to return from a reverie or digression

Other hyponyms of concentrate include absorb, engross, engulf, immerse, plunge, soak up, steep, think, zoom in, hear, listen, take heed.

concentrate (noun)	recall (noun)
a concentrated example of something	the act of removing an official by petition
a concentrated form of a foodstuff; the bulk is reduced by removing water	the process of remembering (especially the process of recovering information by mental effort)
the desired mineral that is left after impurities have been removed from mined ore	a call to return
	a bugle call that signals troops to return
	a request by the manufacturer of a defective product to return the product (as for replacement or repair)

concentrate (verb)	recall (verb)
cook until very little liquid is left	recall knowledge from memory; have a recollection
make denser, stronger, or purer	cause one's (or someone else's) thoughts or attention to return from a reverie or digression
make central	go back to something earlier
be cooked until very little liquid is left	summon to return
make more concise	cause to be returned
compress or concentrate	make unavailable; bar from sale or distribution
direct one's attention on something	bring to mind
draw together or meet in one common center