Crane-jib is a commonly used term in the construction industry to refer to the horizontal arm of a crane that supports the load, usually used in heavy lifting tasks. However, there are various synonyms for the term crane-jib that can be used in different contexts. Some of the possible synonyms for crane-jib include boom, arm, mast, jib arm, cantilever arm, and extension. Each of these terms offers a slightly different shade of meaning and may be more or less appropriate depending on the specific context in which the term is being used. In general, however, these synonyms can be used interchangeably to describe the horizontal arm of a crane.