doubting Thomas vs Thomas the Apostle

doubting Thomas and Thomas the Apostle both are nouns.

Word	Noun	Adjective	Verb	Adverb
doubting Thomas	Yes	No	No	No
Thomas the Apostle	Yes	No	No	No

As nouns, doubting Thomas and Thomas the Apostle are synonyms defined as:

doubting Thomas and Thomas the Apostle: the Apostle who would not believe the resurrection of Jesus until he saw Jesus with his own eyes

Other synonyms of doubting Thomas include Saint Thomas, St. Thomas, Thomas, Thomas the doubting Apostle.

doubting Thomas (noun)	Thomas the Apostle (noun)
the Apostle who would not believe the resurrection of Jesus until he saw Jesus with his own eyes	the Apostle who would not believe the resurrection of Jesus until he saw Jesus with his own eyes
someone who demands physical evidence in order to be convinced (especially when this demand is out of place)