| critical(adjective, great, big, important, substantial) | |
| crowning(adjective, top, excellent, fine, superior) | |
| dealer | |
| employer(noun, superior, judge, boss, leader) | |
| foreman(noun, control, manage, boss, leader) | |
| gaffer | |
| genius | |
| headliner | |
| iconic(adjective, most important) | |
| leading lady | |
| maximum(adjective, top, excellent, fine, superior) | |
| most importantly | |
| noteworthy(adjective, extraordinary, unusual, important, wonderful) | |
| overruling(adjective, importance, serious, essential, basic) | |
| overseer(noun, head, boss, leader, chief) | |
| predominate(adjective, free, top, superior, prime) | |
| preponderant(adjective, free, top, extraordinary, superior) | |
| prima donna(expression, lead, heavy, worthy) | |
| proprietor(noun, master) | |
| rector(noun, person, one) |
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| APA | Smart Define. (2016). principal thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/principal/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "principal thesaurus" https://smartdefine.org/principal/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, principal thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/principal/thesaurus/synonyms>. |
| MLA | Smart Define. "principal thesaurus" 29 March 2016. Web. 25 September 2026. <https://smartdefine.org/principal/thesaurus/synonyms> |