sigmoidoscopy vs flexible sigmoidoscopy

sigmoidoscopy and flexible sigmoidoscopy both are nouns.

Word	Noun	Adjective	Verb	Adverb
sigmoidoscopy	Yes	No	No	No
flexible sigmoidoscopy	Yes	No	No	No

As nouns, sigmoidoscopy and flexible sigmoidoscopy are synonyms defined as:

sigmoidoscopy and flexible sigmoidoscopy: visual examination (with a sigmoidoscope) of the lower third of the colon in a search for polyps

sigmoidoscopy (noun)	flexible sigmoidoscopy (noun)
visual examination (with a sigmoidoscope) of the lower third of the colon in a search for polyps	visual examination (with a sigmoidoscope) of the lower third of the colon in a search for polyps