Reference books that contain words of similar meaning and opposite meaning are called what

Reference books that contain words of similar meaning and opposite meaning are called thesauruses

answer; i believe that they became wealthy from gold and salt in their area, and became powerful by controlling trade in west

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.