sharia law vs shariah

sharia law and shariah both are nouns.

Word	Noun	Adjective	Verb	Adverb
sharia law	Yes	No	No	No
shariah	Yes	No	No	No

As nouns, sharia law and shariah are synonyms defined as:

sharia law and shariah: the code of law derived from the Koran and from the teachings and example of Mohammed

Other synonyms of sharia law include Islamic law, sharia, shariah law.

sharia law (noun)	shariah (noun)
the code of law derived from the Koran and from the teachings and example of Mohammed	the code of law derived from the Koran and from the teachings and example of Mohammed