of sound mind vs compos mentis

of sound mind and compos mentis both are adjectives.

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

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

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

of sound mind (adjective)	compos mentis (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