videodisk vs videodisc

videodisk and videodisc both are nouns.

Word	Noun	Adjective	Verb	Adverb
videodisk	Yes	No	No	No
videodisc	Yes	No	No	No

As nouns, videodisk and videodisc are synonyms defined as:

videodisk and videodisc: a digital recording (as of a movie) on an optical disk that can be played on a computer or a television set

Other synonyms of videodisk include DVD.

videodisk (noun)	videodisc (noun)
a digital recording (as of a movie) on an optical disk that can be played on a computer or a television set	a digital recording (as of a movie) on an optical disk that can be played on a computer or a television set