sufferer vs diseased person

sufferer and diseased person both are nouns.

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

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

Other synonyms of sufferer include sick person.

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