spectrum analysis vs spectroscopy

spectrum analysis and spectroscopy both are nouns.

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

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

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

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

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