Foul
Foul verb - To make dirty.
Tar
Tar verb - Coat with tar.
Foul and tar are semantically related in dirty topic. Sometimes you can use "Foul" instead a verb "Tar", if it concerns topics such as make dirty, cause to be soiled.
Mutual synonyms
Both words in one sentence
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In Chessman of Mars, E-Thas repeats the tales that accuse the jeddak O-Tar of being afraid to go into rooms reputed to be haunted, and quickly assures him that it's all "foul slander".
Source: Malicious Slander - Rincewind also invents a black, tar-like substance that tastes foul and smells faintly of vegetables (in an attempt to drunkenly make vegetable soup with a tin of beer that he leaves on the fire as he falls asleep), which nobody is able to actually stop eating, very much like Vegemite.
Source: Discworld / The Last Continent
Cite this Source
Tar and Foul. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/foul/tar
Foul & Tar. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/foul/tar>.
Tar or Foul. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/foul/tar.
Google Ngram Viewer shows how "foul" and "tar" have occurred on timeline