According to: https://help.libreoffice.org/7.6/en-US/text/shared/01/02100200.html Individual Words Finds characters formatted with Underlining or Strikethrough as Individual words. The description is misleading and incorrect. I propose that the description should be: "Finds characters with the Individual Words attribute, which can be set when using Underlining, Strikethrough, and Overlining."
Seth Chaiklin committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/help/commit/c9e84e0aa79ec1ddeae1e53d1bf70920bb85d896 tdf#152977 correction to description for "Individual Words" attribute