television-camera tube vs television pickup tube

television-camera tube and television pickup tube both are nouns.

Word	Noun	Adjective	Verb	Adverb
television-camera tube	Yes	No	No	No
television pickup tube	Yes	No	No	No

As nouns, television-camera tube and television pickup tube are synonyms defined as:

television-camera tube and television pickup tube: a tube that rapidly scans an optical image and converts it into electronic signals

television-camera tube (noun)	television pickup tube (noun)
a tube that rapidly scans an optical image and converts it into electronic signals	a tube that rapidly scans an optical image and converts it into electronic signals