bitch vs disagreeable person

bitch and disagreeable person both are nouns.

Word	Noun	Adjective	Verb	Adverb
bitch	Yes	No	Yes	No
disagreeable person	Yes	No	No	No

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

bitch: a person (usually but not necessarily a woman) who is thoroughly disliked
disagreeable person: a person who is not pleasant or agreeable

Other hypernyms of bitch include unpleasant person.

bitch (noun)	disagreeable person (noun)
female of any member of the dog family	a person who is not pleasant or agreeable
informal terms for objecting
a person (usually but not necessarily a woman) who is thoroughly disliked
an unpleasant difficulty

bitch (verb)	disagreeable person (verb)
say mean things
complain