television tube vs kinescope

television tube and kinescope both are nouns.

Word	Noun	Adjective	Verb	Adverb
television tube	Yes	No	No	No
kinescope	Yes	No	No	No

As nouns, television tube and kinescope are synonyms defined as:

television tube and kinescope: a cathode-ray tube in a television receiver; translates the received signal into a picture on a luminescent screen

Other synonyms of television tube include picture tube.

television tube (noun)	kinescope (noun)
a cathode-ray tube in a television receiver; translates the received signal into a picture on a luminescent screen	a cathode-ray tube in a television receiver; translates the received signal into a picture on a luminescent screen