retrofit vs retrofit

retrofit and retrofit both are nouns.

Word	Noun	Adjective	Verb	Adverb
retrofit	Yes	No	Yes	No
retrofit	Yes	No	Yes	No

retrofit (noun)	retrofit (noun)
the act of adding a component or accessory to something that did not have it when it was manufactured	the act of adding a component or accessory to something that did not have it when it was manufactured
a component or accessory added to something after it has been manufactured	a component or accessory added to something after it has been manufactured

retrofit (verb)	retrofit (verb)
substitute new or modernized parts or equipment for older ones	substitute new or modernized parts or equipment for older ones
fit in or on an existing structure, such as an older house	fit in or on an existing structure, such as an older house
provide with parts, devices, or equipment not available or in use at the time of the original manufacture	provide with parts, devices, or equipment not available or in use at the time of the original manufacture