radar vs weather radar

radar and weather radar both are nouns.

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

As nouns, weather radar is a hyponym of radar; that is, weather 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
weather radar: radar that is able to detect clouds and precipitation

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

radar (noun)	weather radar (noun)
measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects	radar that is able to detect clouds and precipitation