bell gable vs gable end

bell gable and gable end both are nouns.

Word	Noun	Adjective	Verb	Adverb
bell gable	Yes	No	No	No
gable end	Yes	No	No	No

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

bell gable: an extension of a gable that serves as a bell cote
gable end: the vertical triangular wall between the sloping ends of gable roof

Other hypernyms of bell gable include gable, gable wall.

bell gable (noun)	gable end (noun)
an extension of a gable that serves as a bell cote	the vertical triangular wall between the sloping ends of gable roof