The phrase "smell to high heaven" is a common expression used to describe a strong and unpleasant odor. It can be helpful to have several synonyms for this phrase on hand in order to diversify your vocabulary and avoid repetition. Some alternatives to "smell to high heaven" include "reek," "stink," "foul odor," "stench," and "putrid scent." Other options include descriptions such as "nauseating," "overpowering," "offensive," or "rank." By having multiple synonyms for this phrase, you can more effectively communicate the intensity and unpleasantness of an odor in your writing or speech.