freelance vs do work

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

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

As verbs, do work is a hypernym of freelance; that is, do work is a word with a broader meaning than freelance:

freelance: work independently and on temporary contracts rather than for a long-term employer
do work: be employed

Other hypernyms of freelance include work.

freelance (noun)	do work (noun)
a writer or artist who sells services to different employers without a long-term contract with any of them

freelance (adjective)	do work (adjective)
working for yourself
serving for wages in a foreign army

freelance (verb)	do work (verb)
work independently and on temporary contracts rather than for a long-term employer	be employed