education vs mastering

education and mastering both are nouns.

Word	Noun	Adjective	Verb	Adverb
education	Yes	No	No	No
mastering	Yes	No	No	No

As nouns, mastering is a hyponym of education; that is, mastering is a word with a more specific, narrower meaning than education:

education (noun)	mastering (noun)
the activities of educating or instructing; activities that impart knowledge or skill	the act of making a master recording from which copies can be made
the profession of teaching (especially at a school or college or university)	becoming proficient in the use of something; having mastery of
the result of good upbringing (especially knowledge of correct social behavior)
knowledge acquired by learning and instruction
the gradual process of acquiring knowledge