gadget vs contraption

gadget and contraption both are nouns.

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

As nouns, gadget and contraption are synonyms defined as:

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

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

gadget (noun)	contraption (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