wasting disease vs phthisis

wasting disease and phthisis both are nouns.

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

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

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

Other synonyms of wasting disease include consumption, pulmonary tuberculosis, white plague.

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