practice vs do work

practice is a noun but do work is not a noun.

Word	Noun	Adjective	Verb	Adverb
practice	Yes	No	Yes	No
do work	No	No	Yes	No

practice (noun)	do work (noun)
a customary way of operation or behavior
systematic training by multiple repetitions
the exercise of a profession
translating an idea into action
knowledge of how something is usually done

practice (verb)	do work (verb)
learn by repetition	be employed
engage in a rehearsal (of)
carry out or practice; as of jobs and professions
avail oneself to
engage in or perform