Flu
Mutual synonyms
Both words in one sentence
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A commercial for a flu medication featured Wayne "Newman" Knight playing a personification of the disease, who refuses to leave a family's home as he spreads illness and annoyance to them all.
Source: The Thing That Would Not Leave - Fluttershy's Sick Day is a fanfiction where Fluttershy gets a flu-like illness and makes attempts at Working Through the Cold, which her husband Troy tries to stop.
Source: Sick Episode -
The illness that is sometimes known as "the stomach flu" or "the 24-hour flu" is not even remotely the same virus as the one you get immunized against every year.
Source: Call a Smeerp a "Rabbit"
Cite this Source
Illness and Flu. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/flu/illness
Flu & Illness. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/flu/illness>.
Illness or Flu. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/flu/illness.
Google Ngram Viewer shows how "flu" and "illness" have occurred on timeline