telecasting vs television

telecasting and television both are nouns.

Word	Noun	Adjective	Verb	Adverb
telecasting	Yes	No	No	No
television	Yes	No	No	No

As nouns, telecasting and television are synonyms defined as:

telecasting and television: broadcasting visual images of stationary or moving objects

Other synonyms of telecasting include TV, video.

telecasting (noun)	television (noun)
broadcasting visual images of stationary or moving objects	a telecommunication system that transmits images of objects (stationary or moving) between distant points
	an electronic device that receives television signals and displays them on a screen
	broadcasting visual images of stationary or moving objects