phthisis vs wasting disease

phthisis and wasting disease both are nouns.

Word	Noun	Adjective	Verb	Adverb
phthisis	Yes	No	No	No
wasting disease	Yes	No	No	No

As nouns, phthisis and wasting disease are synonyms defined as:

phthisis and wasting disease: involving the lungs with progressive wasting of the body

Other synonyms of phthisis include consumption, pulmonary tuberculosis, white plague.

phthisis (noun)	wasting disease (noun)
involving the lungs with progressive wasting of the body	involving the lungs with progressive wasting of the body