The crossword solution for the term COUGH SYRUP COVER is CAP, which is a three-letter word. CAP is an abbreviation for a type of headgear that is typically made of cloth and has a visor and a crown. It is often used to protect the head from the sun or rain, but can also be used as a fashion accessory. In this case, it is being used as a metaphor for a cover for cough syrup, suggesting that the syrup should be kept safe and secure.