colonoscopy vs endoscopy

colonoscopy and endoscopy both are nouns.

Word	Noun	Adjective	Verb	Adverb
colonoscopy	Yes	No	No	No
endoscopy	Yes	No	No	No

As nouns, endoscopy is a hypernym of colonoscopy; that is, endoscopy is a word with a broader meaning than colonoscopy:

colonoscopy: visual examination of the colon (with a colonoscope) from the cecum to the rectum; requires sedation
endoscopy: visual examination of the interior of a hollow body organ by use of an endoscope

colonoscopy (noun)	endoscopy (noun)
visual examination of the colon (with a colonoscope) from the cecum to the rectum; requires sedation	visual examination of the interior of a hollow body organ by use of an endoscope