flexible sigmoidoscopy vs sigmoidoscopy

flexible sigmoidoscopy and sigmoidoscopy both are nouns.

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

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

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

flexible sigmoidoscopy (noun)	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