Collocations for supplier - noun

big, key, largest, leading, main, major
small
official, preferred
sole
reliable
external, foreign, outside, overseas
local
independent
automotive (AmE), component, energy (esp. BrE), equipment, food, material, materials, software, etc.
People are encouraged to switch energy supplier to save money.
building material suppliers

electricity, gas, oil
arms

supplier of
the major suppliers of foreign goods

supplier to
the leading arms supplier to the rebel forces