contraption vs injector

contraption and injector both are nouns.

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

As nouns, injector is a hyponym of contraption; that is, injector is a word with a more specific, narrower meaning than contraption:

contraption: a device or control that is very useful for a particular job
injector: a contrivance for injecting (e.g., water into the boiler of a steam engine or particles into an accelerator etc.)

Other hyponyms of contraption include gadgetry, gimbal, mod con.

contraption (noun)	injector (noun)
a device or control that is very useful for a particular job	a contrivance for injecting (e.g., water into the boiler of a steam engine or particles into an accelerator etc.)
	An injector, ejector, steam ejector, steam injector, eductor-jet pump or thermocompressor is a type of pump.