frequency band vs waveband

frequency band and waveband both are nouns.

Word	Noun	Adjective	Verb	Adverb
frequency band	Yes	No	No	No
waveband	Yes	No	No	No

As nouns, frequency band and waveband are synonyms defined as:

frequency band and waveband: a band of adjacent radio frequencies (e.g., assigned for transmitting radio or television signals)

frequency band (noun)	waveband (noun)
a band of adjacent radio frequencies (e.g., assigned for transmitting radio or television signals)	a band of adjacent radio frequencies (e.g., assigned for transmitting radio or television signals)