We don't have synonyms for cod liver oil yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are cod-liver oil and codliver oil.
(n) :
Oil derived from the liver of codfish, often used as a nutritional supplement due to its high levels of omega-3 fatty acids, EPA and DHA, and very high levels of vitamin A and vitamin D.
(n) :
Oil derived from the liver of codfish, often used as a nutritional supplement due to its high levels of omega-3 fatty acids, EPA and DHA, and very high levels of vitamin A and vitamin D.