substance is on the Basic English 850 List.
structure - substance - such

Pronunciation

change
  • (US) IPA (key): /ˈsʌbstəns/ or [ˈsʌbstənts]
  • (file)

Singular
substance

Plural
substances

  1. (countable) What a thing is made of; the essential or most important part of anything. Everything is made of substances.
    Milk has water, sugar, fat and other substances in it.