convenience vs gadget

convenience and gadget both are nouns.

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

As nouns, convenience and gadget are synonyms defined as:

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

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

convenience (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
a toilet that is available to the public
the quality of being useful and convenient
the state of being suitable or opportune