colour television vs colour television system

colour television and colour television system both are nouns.

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

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

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

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

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