diarrhoeic vs diarrheal

diarrhoeic and diarrheal both are adjectives.

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

As adjectives, diarrhoeic and diarrheal are synonyms defined as:

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

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