think vs concentrate

think and concentrate both are nouns.

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

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

think: use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments
concentrate: direct one's attention on something

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

Other hypernyms of think include center, centre, focus, pore, rivet.

think (noun)	concentrate (noun)
an instance of deliberate thinking	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

think (verb)	concentrate (verb)
bring into a given condition by mental preoccupation	cook until very little liquid is left
use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments	make denser, stronger, or purer
judge or regard; look upon; judge	make central
recall knowledge from memory; have a recollection	be cooked until very little liquid is left
expect, believe, or suppose	make more concise
have in mind as a purpose	compress or concentrate
be capable of conscious thought	direct one's attention on something
focus one's attention on a certain state	draw together or meet in one common center
decide by pondering, reasoning, or reflecting
ponder; reflect on, or reason about
have or formulate in the mind
dispose the mind in a certain way
imagine or visualize