dashcam vs tv camera

dashcam and tv camera both are nouns.

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

As nouns, tv camera is a hypernym of dashcam; that is, tv camera is a word with a broader meaning than dashcam:

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

Other hypernyms of dashcam include camera, television camera.

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