pathological vs diseased

pathological and diseased both are adjectives.

Word	Noun	Adjective	Verb	Adverb
pathological	No	Yes	No	No
diseased	No	Yes	No	No

As adjectives, pathological and diseased are synonyms defined as:

pathological and diseased: caused by or altered by or manifesting disease or pathology

Other synonyms of pathological include morbid, pathologic.

pathological (adjective)	diseased (adjective)
of or relating to the practice of pathology	caused by or altered by or manifesting disease or pathology
caused by or evidencing a mentally disturbed condition
caused by or altered by or manifesting disease or pathology