dashcam vs television camera

dashcam and television camera both are nouns.

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

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

dashcam: A camera filming from the dashboard of a car
television 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, tv camera.

dashcam (noun)	television 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