contract vs decrease

contract and decrease both are nouns.

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

As verbs, decrease is a hypernym of contract; that is, decrease is a word with a broader meaning than contract:

Other hypernyms of contract include diminish, fall, lessen.

As verbs, decrease is a hypernym of contract; that is, decrease is a word with a broader meaning than contract:

Other hypernyms of contract include lessen, minify.

contract (noun)	decrease (noun)
a variety of bridge in which the bidder receives points toward game only for the number of tricks he bid	the act of decreasing or reducing something
a binding agreement between two or more persons that is enforceable by law	the amount by which something decreases
(contract bridge) the highest bid becomes the contract setting the number of tricks that the bidder must make	a change downward
	a process of becoming smaller or shorter

contract (verb)	decrease (verb)
be stricken by an illness, fall victim to an illness	decrease in size, extent, or range
make or become more narrow or restricted	make become smaller
become smaller or draw together
reduce in scope while retaining essential elements
compress or concentrate
enter into a contractual arrangement
make smaller
squeeze or press together
engage by written agreement