videodisc vs DVD

videodisc and DVD both are nouns.

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

As nouns, videodisc and DVD are synonyms defined as:

videodisc and DVD: 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 videodisc include videodisk.

videodisc (noun)	DVD (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