substrative

• a word derived from substratum.
  substratum

  noun

  something that is spread or laid under something else; a stratum or layer lying under another.

Related Words

• central
• constitutional
• crucial
• elemental
• elementary
• essential
• indispensable
• integral
• intrinsic
• major
• necessary
• paramount
• principal
• radical
• significant
• structural
• theoretical
• underlying
• vital