diarrhoeal vs diarrheic

diarrhoeal and diarrheic both are adjectives.

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

As adjectives, diarrhoeal and diarrheic are synonyms defined as:

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

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