sitcom vs television show

sitcom and television show both are nouns.

Word	Noun	Adjective	Verb	Adverb
sitcom	Yes	No	No	No
television show	Yes	No	No	No

As nouns, television show is a hypernym of sitcom; that is, television show is a word with a broader meaning than sitcom:

sitcom: a humorous television program based on situations that could arise in everyday life
television show: a program broadcast by television

Other hypernyms of sitcom include television program, TV program, TV show.

sitcom (noun)	television show (noun)
a humorous television program based on situations that could arise in everyday life	a program broadcast by television
a humorous drama based on situations that might arise in day-to-day life