corbie-step vs stair

corbie-step and stair both are nouns.

Word	Noun	Adjective	Verb	Adverb
corbie-step	Yes	No	No	No
stair	Yes	No	No	No

As nouns, stair is a hypernym of corbie-step; that is, stair is a word with a broader meaning than corbie-step:

corbie-step: (architecture) a step on the top of a gable wall
stair: support consisting of a place to rest the foot while ascending or descending a stairway

Other hypernyms of corbie-step include step.

corbie-step (noun)	stair (noun)
(architecture) a step on the top of a gable wall	support consisting of a place to rest the foot while ascending or descending a stairway