Obligatory Synonyms and Antonyms

ə-blĭgə-tôrē, ŏblĭ-gə-
Imposed on one by authority, command, or convention
  1. optional
Essential, required

Words Related to Obligatory

Related words are words that are directly connected to each other through their meaning, even if they are not synonyms or antonyms. This connection may be general or specific, or the words may appear frequently together.