riffraff vs ragtag and bobtail

riffraff and ragtag and bobtail both are nouns.

Word	Noun	Adjective	Verb	Adverb
riffraff	Yes	No	No	No
ragtag and bobtail	Yes	No	No	No

As nouns, riffraff and ragtag and bobtail are synonyms defined as:

riffraff and ragtag and bobtail: disparaging terms for the common people

Other synonyms of riffraff include rabble, ragtag.

riffraff (noun)	ragtag and bobtail (noun)
disparaging terms for the common people	disparaging terms for the common people