nevoid elephantiasis vs pachyderma

nevoid elephantiasis and pachyderma both are nouns.

Word	Noun	Adjective	Verb	Adverb
nevoid elephantiasis	Yes	No	No	No
pachyderma	Yes	No	No	No

As nouns, nevoid elephantiasis and pachyderma are synonyms defined as:

nevoid elephantiasis and pachyderma: thickening of the skin (usually unilateral on an extremity) caused by congenital enlargement of lymph vessel and lymph vessel obstruction

nevoid elephantiasis (noun)	pachyderma (noun)
thickening of the skin (usually unilateral on an extremity) caused by congenital enlargement of lymph vessel and lymph vessel obstruction	thickening of the skin (usually unilateral on an extremity) caused by congenital enlargement of lymph vessel and lymph vessel obstruction