spectroscopy vs spectrum analysis

spectroscopy and spectrum analysis both are nouns.

Word	Noun	Adjective	Verb	Adverb
spectroscopy	Yes	No	No	No
spectrum analysis	Yes	No	No	No

As nouns, spectroscopy and spectrum analysis are synonyms defined as:

spectroscopy and spectrum analysis: the use of spectroscopes to analyze spectra

Other synonyms of spectroscopy include spectrographic analysis, spectrometry, spectroscopic analysis.

spectroscopy (noun)	spectrum analysis (noun)
the use of spectroscopes to analyze spectra	the use of spectroscopes to analyze spectra