diarrhoeal vs diarrheal

diarrhoeal and diarrheal both are adjectives.

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

As adjectives, diarrhoeal and diarrheal are synonyms defined as:

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

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