TV channel vs television channel

TV channel and television channel both are nouns.

Word	Noun	Adjective	Verb	Adverb
TV channel	Yes	No	No	No
television channel	Yes	No	No	No

As nouns, TV channel and television channel are synonyms defined as:

TV channel and television channel: a television station and its programs

Other synonyms of TV channel include channel.

TV channel (noun)	television channel (noun)
a television station and its programs	a television station and its programs