| plea | |
| portent(noun, sign, notice, alert, caution) | |
| prediction(noun, sign, notice, alert, caution) | |
| request | |
| solicitation | |
| suggestion(noun, sign, notice, alert, caution) | |
| summons | |
| order | |
| whistle(noun, alert, cry, caution, signal) | |
| word of warning(expression, idiom, notice, caution, caveat) |
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| APA | Smart Define. (2013). sos thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/sos/thesaurus/synonyms |
| Chicago | Smart Define. 2013. "sos thesaurus" https://smartdefine.org/sos/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2013, sos thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/sos/thesaurus/synonyms>. |
| MLA | Smart Define. "sos thesaurus" 17 June 2013. Web. 23 September 2026. <https://smartdefine.org/sos/thesaurus/synonyms> |