weighbridge vs weighing machine

weighbridge and weighing machine both are nouns.

Word	Noun	Adjective	Verb	Adverb
weighbridge	Yes	No	No	No
weighing machine	Yes	No	No	No

As nouns, weighing machine is a hypernym of weighbridge; that is, weighing machine is a word with a broader meaning than weighbridge:

weighbridge: platform scale flush with a roadway for weighing vehicles and cattle etc
weighing machine: a measuring instrument for weighing; shows amount of mass

Other hypernyms of weighbridge include scale.

weighbridge (noun)	weighing machine (noun)
platform scale flush with a roadway for weighing vehicles and cattle etc	a measuring instrument for weighing; shows amount of mass