antitrust legislation vs antitrust law

antitrust legislation and antitrust law both are nouns.

Word	Noun	Adjective	Verb	Adverb
antitrust legislation	Yes	No	No	No
antitrust law	Yes	No	No	No

As nouns, antitrust legislation and antitrust law are synonyms defined as:

antitrust legislation and antitrust law: law intended to promote free competition in the market place by outlawing monopolies

antitrust legislation (noun)	antitrust law (noun)
law intended to promote free competition in the market place by outlawing monopolies	law intended to promote free competition in the market place by outlawing monopolies