gastroscope vs endoscope

gastroscope and endoscope both are nouns.

Word	Noun	Adjective	Verb	Adverb
gastroscope	Yes	No	No	No
endoscope	Yes	No	No	No

As nouns, endoscope is a hypernym of gastroscope; that is, endoscope is a word with a broader meaning than gastroscope:

gastroscope: a type of endoscope for visually examining the stomach
endoscope: a long slender medical instrument for examining the interior of a bodily organ or performing minor surgery

gastroscope (noun)	endoscope (noun)
a type of endoscope for visually examining the stomach	a long slender medical instrument for examining the interior of a bodily organ or performing minor surgery