legalese vs expressive style

legalese and expressive style both are nouns.

Word	Noun	Adjective	Verb	Adverb
legalese	Yes	No	No	No
expressive style	Yes	No	No	No

As nouns, expressive style is a hypernym of legalese; that is, expressive style is a word with a broader meaning than legalese:

legalese: a style that uses the abstruse technical vocabulary of the law
expressive style: a way of expressing something (in language or art or music etc.) that is characteristic of a particular person or group of people or period

Other hypernyms of legalese include style.

legalese (noun)	expressive style (noun)
a style that uses the abstruse technical vocabulary of the law	a way of expressing something (in language or art or music etc.) that is characteristic of a particular person or group of people or period