radio detection and ranging vs microwave radar

radio detection and ranging and microwave radar both are nouns.

Word	Noun	Adjective	Verb	Adverb
radio detection and ranging	Yes	No	No	No
microwave radar	Yes	No	No	No

As nouns, radio detection and ranging and microwave radar are synonyms defined as:

radio detection and ranging and microwave radar: measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects

Other synonyms of radio detection and ranging include radar, radiolocation.

radio detection and ranging (noun)	microwave radar (noun)
measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects	measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects