libration vs oscillation

libration and oscillation both are nouns.

Word	Noun	Adjective	Verb	Adverb
libration	Yes	No	No	No
oscillation	Yes	No	No	No

As nouns, oscillation is a hypernym of libration; that is, oscillation is a word with a broader meaning than libration:

libration: (astronomy) a real or apparent slow oscillation of a moon or satellite
oscillation: the process of oscillating between states

Other hypernyms of libration include variation.

libration (noun)	oscillation (noun)
(astronomy) a real or apparent slow oscillation of a moon or satellite	(physics) a regular periodic variation in value about a mean
	a single complete execution of a periodically repeated phenomenon
	the process of oscillating between states