pediment vs gable

pediment and gable both are nouns.

Word	Noun	Adjective	Verb	Adverb
pediment	Yes	No	No	No
gable	Yes	No	No	No

As nouns, gable is a hypernym of pediment; that is, gable is a word with a broader meaning than pediment:

pediment: a triangular gable between a horizontal entablature and a sloping roof
gable: the vertical triangular wall between the sloping ends of gable roof

Other hypernyms of pediment include gable end, gable wall.

pediment (noun)	gable (noun)
a triangular gable between a horizontal entablature and a sloping roof	the vertical triangular wall between the sloping ends of gable roof