common-law marriage vs law

common-law marriage and law both are nouns.

Word	Noun	Adjective	Verb	Adverb
common-law marriage	Yes	No	No	No
law	Yes	No	No	No

common-law marriage (noun)	law (noun)
a marriage relationship created by agreement and cohabitation rather than by ceremony	the learned profession that is mastered by graduate study in a law school and that is responsible for the judicial system
	a rule or body of rules of conduct inherent in human nature and essential to or binding upon human society
	a generalization that describes recurring facts or events in nature
	the branch of philosophy concerned with the law and the principles that lead courts to make the decisions they do
	legal document setting forth rules governing a particular kind of activity
	the collection of rules imposed by authority
	the force of policemen and officers