| complaint(noun, disorder, collapse, condition, sickness) | |
| condition(noun, disorder, illness, sickness, affliction) | |
| confinement(noun, disorder, disease, weakness, collapse) | |
| coniosis | |
| contagion(noun, disorder, defect, taint, affliction) | |
| contamination(noun, disorder, defect, taint, sickness) | |
| convalescence(noun, disorder, disease, collapse, disturbance) | |
| convulsions(noun, disorder, illness, defect, sickness) | |
| cowpox | |
| croup | |
| croupous pneumonia | |
| dandy fever | |
| delicacy(noun, weakness, failing, infirmity, fragility) | |
| delicateness(noun, weakness, failing, delicacy, infirmity) | |
| disability(noun, disorder, disease, weakness, collapse) | |
| diseasedness(noun, disorder, disease, weakness, collapse) | |
| disorder(noun, disease, weakness, collapse, condition) | |
| distemper(noun, disorder, illness, defect, sickness) | |
| dose(noun, disorder, disease, collapse, condition) | |
| double pneumonia |
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| APA | Smart Define. (2015). flu thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/flu/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "flu thesaurus" https://smartdefine.org/flu/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, flu thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/flu/thesaurus/synonyms>. |
| MLA | Smart Define. "flu thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/flu/thesaurus/synonyms> |