contraption vs convenience

contraption and convenience both are nouns.

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

As nouns, contraption and convenience are synonyms defined as:

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

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

contraption (noun)	convenience (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