camera vs dashcam

camera and dashcam both are nouns.

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

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

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 camera include camcorder.

camera (noun)	dashcam (noun)
equipment for taking photographs (usually consisting of a lightproof box with a lens at one end and light-sensitive film at the other)	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