color television system vs color television

color television system and color television both are nouns.

Word	Noun	Adjective	Verb	Adverb
color television system	Yes	No	No	No
color television	Yes	No	No	No

As nouns, color television system and color television are synonyms defined as:

color television system and color television: a television that transmits images in color

Other synonyms of color television system include color TV, colour television, colour television system, colour TV.

color television system (noun)	color television (noun)
a television that transmits images in color	a television that transmits images in color