take heed vs concentrate

take heed is not a noun while concentrate is a noun.

Word	Noun	Adjective	Verb	Adverb
take heed	No	No	Yes	No
concentrate	Yes	No	Yes	No

As verbs, concentrate is a hypernym of take heed; that is, concentrate is a word with a broader meaning than take heed:

Other hypernyms of take heed include center, centre, focus, pore, rivet.

take heed (noun)	concentrate (noun)
	a concentrated example of something
	a concentrated form of a foodstuff; the bulk is reduced by removing water
	the desired mineral that is left after impurities have been removed from mined ore

take heed (verb)	concentrate (verb)
listen and pay attention	cook until very little liquid is left
	make denser, stronger, or purer
	make central
	be cooked until very little liquid is left
	make more concise
	compress or concentrate
	direct one's attention on something
	draw together or meet in one common center