hematochezia vs defecation

hematochezia and defecation both are nouns.

Word	Noun	Adjective	Verb	Adverb
hematochezia	Yes	No	No	No
defecation	Yes	No	No	No

As nouns, defecation is a hypernym of hematochezia; that is, defecation is a word with a broader meaning than hematochezia:

hematochezia: passage of stools containing blood (as from diverticulosis or colon cancer or peptic ulcer)
defecation: the elimination of fecal waste through the anus

Other hypernyms of hematochezia include laxation, shitting.

hematochezia (noun)	defecation (noun)
passage of stools containing blood (as from diverticulosis or colon cancer or peptic ulcer)	the elimination of fecal waste through the anus