Practice - "the exercise of a profession or occupation"
Occupation - "that which chiefly engages one's time; (one's) trade, profession or business"
Profession - "a vocation or occupation requiring advanced education and training, and involving intellectual skills"
Professional - "of, engaged in, or worthy of the high standards of a profession"
Trade - "an occupation requiring skill in any of certain kinds of work done with the hands, as distinguished from unskilled work or from a profession or business.
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