contract vs concentrate

contract and concentrate both are nouns.

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

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

Other hyponyms of contract include bowdlerise, bowdlerize, castrate, expurgate, shorten, condense, digest.

As verbs, contract and concentrate are synonyms defined as:

Other synonyms of contract include condense.

contract (noun)	concentrate (noun)
a variety of bridge in which the bidder receives points toward game only for the number of tricks he bid	a concentrated example of something
a binding agreement between two or more persons that is enforceable by law	a concentrated form of a foodstuff; the bulk is reduced by removing water
(contract bridge) the highest bid becomes the contract setting the number of tricks that the bidder must make	the desired mineral that is left after impurities have been removed from mined ore

contract (verb)	concentrate (verb)
be stricken by an illness, fall victim to an illness	cook until very little liquid is left
make or become more narrow or restricted	make denser, stronger, or purer
become smaller or draw together	make central
reduce in scope while retaining essential elements	be cooked until very little liquid is left
compress or concentrate	make more concise
enter into a contractual arrangement	compress or concentrate
make smaller	direct one's attention on something
squeeze or press together	draw together or meet in one common center
engage by written agreement