Moot point and Matter of opinion

Matter of opinion and moot point are semantically related In some cases you can use "Matter of opinion" instead the phrase "Moot point" as a noun or an adjective.

Moot point and matter of opinion are semantically related in open to question topic. You can use "Moot point" instead the phrase "Matter of opinion" as a noun or an adjective, if it concerns topics such as debatable point.