radio frequency vs frequency

radio frequency and frequency both are nouns.

Word	Noun	Adjective	Verb	Adverb
radio frequency	Yes	No	No	No
frequency	Yes	No	No	No

As nouns, frequency is a hypernym of radio frequency; that is, frequency is a word with a broader meaning than radio frequency:

radio frequency: an electromagnetic wave frequency between audio and infrared
frequency: the number of occurrences within a given time period

Other hypernyms of radio frequency include frequence, oftenness.

radio frequency (noun)	frequency (noun)
an electromagnetic wave frequency between audio and infrared	the number of observations in a given statistical category
	the ratio of the number of observations in a statistical category to the total number of observations
	the number of occurrences within a given time period