Beche de mer, also known as sea cucumbers, are marine animals that are considered a delicacy in some cultures. However, the concept of antonyms for this word may sound confusing as there are no direct opposites to it. One could use synonyms such as "ocean-dwellers" or "sea creatures" instead of "beche de mer." Alternatively, if one were looking for a contrasting term, they could consider a word that represents something that is not edible, such as "coral reefs" or "seaweed." Overall, when referring to marine animals or delicacies, it is important to use descriptive terms that do not offend or degrade any particular group or culture.