career vs occupation

career and occupation both are nouns.

Word	Noun	Adjective	Verb	Adverb
career	Yes	No	Yes	No
occupation	Yes	No	No	No

As nouns, occupation is a hypernym of career; that is, occupation is a word with a broader meaning than career:

Other hypernyms of career include business, job, line, line of work.

career (noun)	occupation (noun)
the particular occupation for which you are trained	the principal activity in your life that you do to earn money
the general progression of your working or professional life	the act of occupying or taking possession of a building
	the control of a country by military forces of a foreign power
	any activity that occupies a person's attention
	the period of time during which a place or position or nation is occupied

career (verb)	occupation (verb)
move headlong at high speed