noun
ADJECTIVE
▪ 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 ~ to save money.
▪
building material ~s
▪ electricity , gas , oil
▪ arms
PREPOSITION
▪ ~ of
▪
the major ~s of foreign goods
▪ ~ to
▪
the leading arms ~ to the rebel forces