fatwah vs legal opinion

fatwah and legal opinion both are nouns.

Word	Noun	Adjective	Verb	Adverb
fatwah	Yes	No	No	No
legal opinion	Yes	No	No	No

As nouns, legal opinion is a hypernym of fatwah; that is, legal opinion is a word with a broader meaning than fatwah:

fatwah: (Islam) a legal opinion or ruling issued by an Islamic scholar
legal opinion: the legal document stating the reasons for a judicial decision

Other hypernyms of fatwah include judgement, judgment, opinion.

fatwah (noun)	legal opinion (noun)
(Islam) a legal opinion or ruling issued by an Islamic scholar	the legal document stating the reasons for a judicial decision