Sponson is a term commonly used in the maritime industry to refer to external structures attached to a vessel for stability. However, there are several synonyms for sponson that may also be used. One of the most commonly used alternatives is "outrigger", which refers to a projecting structure attached to a boat or canoe. Other synonyms include "projections", "stabilizers", "appendages", and "wings". These terms are often used interchangeably to describe structures that help maintain or improve the stability of a watercraft. While sponsons may be a specific type of outrigger, understanding these other terms can help provide a broader understanding of nautical terminology.