unwritten vs common-law

unwritten and common-law both are adjectives.

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

unwritten (adjective)	common-law (adjective)
based on custom rather than documentation	based on common law
using speech rather than writing
said or done without having been planned or written in advance