contraption vs contrivance

contraption and contrivance both are nouns.

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

As nouns, contraption and contrivance are synonyms defined as:

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

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

contraption (noun)	contrivance (noun)
a device or control that is very useful for a particular job	the act of devising something
	a device or control that is very useful for a particular job
	any improvised arrangement for temporary use
	an elaborate or deceitful scheme contrived to deceive or evade
	the faculty of contriving; inventive skill
	an artificial or unnatural or obviously contrived arrangement of details or parts etc.