gismo vs gadget

gismo and gadget both are nouns.

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

As nouns, gismo and gadget are synonyms defined as:

gismo and gadget: a device or control that is very useful for a particular job

Other synonyms of gismo include appliance, contraption, contrivance, convenience, gizmo, widget.

gismo (noun)	gadget (noun)
a device or control that is very useful for a particular job	a device or control that is very useful for a particular job
something unspecified whose name is either forgotten or not known