The word "mast-" can have multiple synonyms based on its meaning. One of the most common synonyms for this word is "pole," which is often used to describe a long, slender structure that is used to support other objects or hold them in place. Another synonym for "mast-" is "post," which is often used to describe a vertical beam that is used to support or connect other structures. Other synonyms that are commonly used to describe "mast-" include "pillar," "column," "shaft," and "stanchion." These words are often used interchangeably to describe various types of structures that are designed to provide support or stability.