radar vs Doppler radar

radar and Doppler radar both are nouns.

Word	Noun	Adjective	Verb	Adverb
radar	Yes	No	No	No
Doppler radar	Yes	No	No	No

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

radar: measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects
Doppler radar: radar that uses the Doppler shift to measure velocity

Other hyponyms of radar include early warning radar, 3d radar, three-dimensional radar, weather radar.

radar (noun)	Doppler radar (noun)
measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects	radar that uses the Doppler shift to measure velocity