Difference between 语言 and 言语?
言语 is not a frequently used words. It is a spoken word in north(at least Beijing,north-easten).

It means 'talk(talking), speak(speaking)' ,Depending on the context, it can take the place of any words that means 'talk or speak with someone'.


  你需要跟我言语一声儿. (言语 means consult, ask or notify... )


"he used aggressive language"

It is not incorrect to use 言语. But 语言 or 话 is more common.