At first this sentence does not seem to be grammatically correct. I would assume that 'mysterious diseases pathology' would be a branch of pathology. In this case diseases would be an adjective. In conjunction with 'mysterious', the word describes pathology.
part of speech
Adjective
The suffix usually indicates the procedure, condition, disease, or the part of speech (ex. noun, adjective, etc.)
What part of speech is thaw
The word "healed" can function as both a verb and an adjective. As a verb, it is the past tense of "heal," meaning to restore to health. As an adjective, it describes something that has been made whole or free from injury or disease. The context in which it is used determines its part of speech.
"Hydrophobia" is a noun, the name of a disease.
It is a noun because it is the name of a disease
The word pneumonoultramicroscopicsilicovolcanoconiosis is a noun. It was coined by Everett K Smith and is a factitious disease of the lungs.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "twirl" is a verb.
The part of speech for "explicit" is an adjective.