white plague vs phthisis

white plague and phthisis both are nouns.

Word	Noun	Adjective	Verb	Adverb
white plague	Yes	No	No	No
phthisis	Yes	No	No	No

As nouns, white plague and phthisis are synonyms defined as:

white plague and phthisis: involving the lungs with progressive wasting of the body

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

white plague (noun)	phthisis (noun)
involving the lungs with progressive wasting of the body	involving the lungs with progressive wasting of the body
an addiction to a drug (especially a narcotic drug)