Basis and Substratum

Basis noun - An immaterial thing upon which something else rests.

Substratum is a synonym for basis in action topic. In some cases you can use "Substratum" instead a noun "Basis", when it comes to topics like over.

Nearby Word: basic

Substratum noun - Any stratum or layer lying underneath another.

Basis is a synonym for substratum in base topic. You can use "Basis" instead a noun "Substratum", if it concerns topics such as over.

Nearby Word: substrate