Base and Underlay

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

Underlay and base are semantically related. In some cases you can replace term "Underlay" with "Base", this nouns are similar.

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

Underlay noun - A pad placed under a carpet.

Base and underlay are semantically related. Sometimes you can use "Base" instead a noun "Underlay".