medivac vs medevac

medivac and medevac both are nouns.

Word	Noun	Adjective	Verb	Adverb
medivac	Yes	No	No	No
medevac	Yes	No	No	No

As nouns, medivac and medevac are synonyms defined as:

medivac and medevac: the evacuation of persons (usually by air transportation) to a place where they can receive medical care

Other synonyms of medivac include medical evacuation.

medivac (noun)	medevac (noun)
the evacuation of persons (usually by air transportation) to a place where they can receive medical care	the evacuation of persons (usually by air transportation) to a place where they can receive medical care