picture tube vs kinescope

picture tube and kinescope both are nouns.

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

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

picture 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 picture tube include television tube.

picture 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