Base and Substratum

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

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

Nearby Words: basic, basal, based, baseline, baseball

Substratum noun - Any stratum or layer lying underneath another.

Base is a synonym for substratum in over topic. You can use "Base" instead a noun "Substratum".

Nearby Word: substrate