television pickup tube vs television-camera tube

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

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

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

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

television pickup tube (noun)	television-camera 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