noun which may take the genitive case particle 'no'
Used as a no-adjective modifying a noun, meaning 'relating to the constitution' or 'under the constitution'.
憲法上の権利を守ることは重要だ。
Protecting constitutional rights is important.
adverb
constitutionally
Used adverbially to describe an action or state from a constitutional standpoint.
その法律は憲法上問題があると指摘された。
It was pointed out that the law is constitutionally problematic.