diarrheal vs diarrheic

diarrheal and diarrheic both are adjectives.

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

As adjectives, diarrheal and diarrheic are synonyms defined as:

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

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