renal lithiasis vs nephrolithiasis

renal lithiasis and nephrolithiasis both are nouns.

Word	Noun	Adjective	Verb	Adverb
renal lithiasis	Yes	No	No	No
nephrolithiasis	Yes	No	No	No

As nouns, renal lithiasis and nephrolithiasis are synonyms defined as:

renal lithiasis and nephrolithiasis: the presence of kidney stones (calculi) in the kidney

renal lithiasis (noun)	nephrolithiasis (noun)
the presence of kidney stones (calculi) in the kidney	the presence of kidney stones (calculi) in the kidney