Saponacity is a relatively uncommon word that refers to the quality of being soapy or having soap-like qualities. When looking for synonyms for this term, one might consider using words like sudsy, foamy, frothy, lathery, or even bubbly. These words all carry similar connotations to saponacity, describing a substance that produces lather or bubbles when mixed with water. Other synonyms may include soapy, detergent-like, surfactant, or cleansing. Regardless of the specific word chosen, when discussing the quality of soap or soap-like substances, there are many synonyms available to help describe this unique and useful quality of cleanliness.