diarrhetic vs diarrheal

diarrhetic and diarrheal both are adjectives.

Word	Noun	Adjective	Verb	Adverb
diarrhetic	No	Yes	No	No
diarrheal	No	Yes	No	No

As adjectives, diarrhetic and diarrheal are synonyms defined as:

Other synonyms of diarrhetic include diarrheic, diarrhoeal, diarrhoeic, diarrhoetic.

diarrhetic (adjective)	diarrheal (adjective)
of or relating to diarrhea	of or relating to diarrhea