A vent-hole is a small opening or outlet that allows air, gas, or liquid to escape or circulate. Synonyms for vent-hole include air hole, escape hole, outlet, aperture, opening, breach, puncture, perforation, and slit. These terms refer to various types of holes in different objects, structures, or materials. For instance, an air hole is a small opening in an object to allow air to escape or enter, while an outlet refers to a passage or exit for fluid or gas. A perforation, on the other hand, is a hole made by piercing or boring through a material, such as paper or cardboard. Ultimately, the choice of synonyms depends on the context and intended meaning of the term vent-hole.