diarrhoea vs diarrhea

diarrhoea and diarrhea both are nouns.

Word	Noun	Adjective	Verb	Adverb
diarrhoea	Yes	No	No	No
diarrhea	Yes	No	No	No

As nouns, diarrhoea and diarrhea are synonyms defined as:

diarrhoea and diarrhea: frequent and watery bowel movements; can be a symptom of infection or food poisoning or colitis or a gastrointestinal tumor

Other synonyms of diarrhoea include looseness, looseness of the bowels.

diarrhoea (noun)	diarrhea (noun)
frequent and watery bowel movements; can be a symptom of infection or food poisoning or colitis or a gastrointestinal tumor	frequent and watery bowel movements; can be a symptom of infection or food poisoning or colitis or a gastrointestinal tumor