fundamental frequency vs fundamental

fundamental frequency and fundamental both are nouns.

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

As nouns, fundamental frequency and fundamental are synonyms defined as:

fundamental frequency and fundamental: the lowest tone of a harmonic series

Other synonyms of fundamental frequency include first harmonic.

fundamental frequency (noun)	fundamental (noun)
the lowest tone of a harmonic series	the lowest tone of a harmonic series
	any factor that could be considered important to the understanding of a particular business

fundamental frequency (adjective)	fundamental (adjective)
	being or involving basic facts or principles
	serving as an essential component
	far-reaching and thoroughgoing in effect especially on the nature of something