compos mentis vs of sound mind

compos mentis and of sound mind both are adjectives.

Word	Noun	Adjective	Verb	Adverb
compos mentis	No	Yes	No	No
of sound mind	No	Yes	No	No

As adjectives, compos mentis and of sound mind are synonyms defined as:

compos mentis and of sound mind: of sound mind, memory, and understanding; in law, competent to go to trial

compos mentis (adjective)	of sound mind (adjective)
of sound mind, memory, and understanding; in law, competent to go to trial	of sound mind, memory, and understanding; in law, competent to go to trial