107 entries under basic topic. ×
| mandatory(adjective, significant, essential, vital) | |
| name of game(expression, adjective, idiom, significant, essential) | |
| obligatory(adjective, significant, essential, vital) | |
| part | |
| portion | |
| specified(adjective, significant, essential, vital) | |
| unavoidable(adjective, significant, essential, vital) |
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| APA | Smart Define. (2016). principal thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/principal/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "principal thesaurus" https://smartdefine.org/principal/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2016, principal thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/principal/thesaurus/synonyms>. |
| MLA | Smart Define. "principal thesaurus" 29 March 2016. Web. 20 September 2026. <https://smartdefine.org/principal/thesaurus/synonyms> |