gimbal vs gismo

gimbal and gismo both are nouns.

Word	Noun	Adjective	Verb	Adverb
gimbal	Yes	No	No	No
gismo	Yes	No	No	No

As nouns, gismo is a hypernym of gimbal; that is, gismo is a word with a broader meaning than gimbal:

gimbal: an appliance that allows an object (such as a ship's compass) to remain horizontal even as its support tips
gismo: a device or control that is very useful for a particular job

Other hypernyms of gimbal include appliance, contraption, contrivance, convenience, gadget, gizmo, widget.

gimbal (noun)	gismo (noun)
an appliance that allows an object (such as a ship's compass) to remain horizontal even as its support tips	a device or control that is very useful for a particular job
	something unspecified whose name is either forgotten or not known