class-action suit vs class action

class-action suit and class action both are nouns.

Word	Noun	Adjective	Verb	Adverb
class-action suit	Yes	No	No	No
class action	Yes	No	No	No

As nouns, class-action suit and class action are synonyms defined as:

class-action suit and class action: a lawsuit brought by a representative member of a large group of people on behalf of all members of the group

class-action suit (noun)	class action (noun)
a lawsuit brought by a representative member of a large group of people on behalf of all members of the group	a lawsuit brought by a representative member of a large group of people on behalf of all members of the group