diarrheic vs diarrheal

diarrheic and diarrheal both are adjectives.

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

As adjectives, diarrheic and diarrheal are synonyms defined as:

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

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