tv camera vs dashcam

tv camera and dashcam both are nouns.

Word	Noun	Adjective	Verb	Adverb
tv camera	Yes	No	No	No
dashcam	Yes	No	No	No

As nouns, dashcam is a hyponym of tv camera; that is, dashcam is a word with a more specific, narrower meaning than tv camera:

tv camera: television equipment consisting of a lens system that focuses an image on a photosensitive mosaic that is scanned by an electron beam
dashcam: A camera filming from the dashboard of a car

Other hyponyms of tv camera include camcorder.

tv camera (noun)	dashcam (noun)
television equipment consisting of a lens system that focuses an image on a photosensitive mosaic that is scanned by an electron beam	A camera filming from the dashboard of a car