scum bag vs disagreeable person

scum bag and disagreeable person both are nouns.

Word	Noun	Adjective	Verb	Adverb
scum bag	Yes	No	No	No
disagreeable person	Yes	No	No	No

As nouns, disagreeable person is a hypernym of scum bag; that is, disagreeable person is a word with a broader meaning than scum bag:

Other hypernyms of scum bag include unpleasant person.

scum bag (noun)	disagreeable person (noun)
a person who is deemed to be despicable or contemptible	a person who is not pleasant or agreeable