diarrheic vs diarrhoeal

diarrheic and diarrhoeal both are adjectives.

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

As adjectives, diarrheic and diarrhoeal are synonyms defined as:

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

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