diseased person vs sufferer

diseased person and sufferer both are nouns.

Word	Noun	Adjective	Verb	Adverb
diseased person	Yes	No	No	No
sufferer	Yes	No	No	No

As nouns, diseased person and sufferer are synonyms defined as:

Other synonyms of diseased person include sick person.

diseased person (noun)	sufferer (noun)
a person suffering from an illness	a person suffering from an illness
	one who suffers for the sake of principle