| passport(noun, permit, sanction, authorization, permission) | |
| pat on back(expression, support, authorization, commendation, confirmation) | |
| permission to enter(expression, idiom) | |
| pilot flag | |
| poke | |
| police whistle | |
| qualification(support, authorization, commendation, confirmation, commercial) | |
| quarantine flag | |
| radio beacon | |
| recommendation(noun, support, favor, approval, sanction) | |
| red flag | |
| release | |
| rocket | |
| sailing aid | |
| say-so(noun, support, order, agreement, command) | |
| seal | |
| seal of approval(noun, expression, idiom, support, favor) | |
| semaphore | |
| semaphore flag | |
| semaphore telegraph |
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| APA | Smart Define. (2015). green light thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/green_light/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "green light thesaurus" https://smartdefine.org/green_light/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, green light thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/green_light/thesaurus/synonyms>. |
| MLA | Smart Define. "green light thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/green_light/thesaurus/synonyms> |