riffraff

Riffraff is a synonym of mob.

As nouns the difference between mob and riffraff

is that mob is an unruly group of people while riffraff is the rabble; crowds; the common people.

As a verb mob

is to crowd around (someone), often with hostility.

As an abbreviation mob

is mobile phone.

As an initialism MOB

is Man Over Board, used e.g. on the emergency button of a satellite navigator. By pushing the button the operator stores the coordinates of a man overboard incident for easy access.

As nouns the difference between riffraff and lowlife

is that riffraff is the rabble; crowds; the common people while lowlife is an untrustworthy, despicable, or disreputable person, especially one suspected of being a criminal.

As nouns the difference between ruffian and riffraff

is that ruffian is a scoundrel, rascal, or unprincipled, deceitful, brutal and unreliable person while riffraff is the rabble; crowds; the common people.

As a verb ruffian

is to play the ruffian; to rage; to raise tumult.

As an adjective ruffian

is brutal; cruel; savagely boisterous; murderous.

As nouns the difference between scum and riffraff

is that scum is (uncountable) a layer of impurities that accumulates at the surface of a liquid (especially molten metal or water) while riffraff is the rabble; crowds; the common people.

As a verb scum

is to remove the layer of scum from (a liquid etc).

As a proper noun savage

is .

As a noun riffraff is

the rabble; crowds; the common people.