quick buck vs profit

quick buck and profit both are nouns.

Word	Noun	Adjective	Verb	Adverb
quick buck	Yes	No	No	No
profit	Yes	No	Yes	No

As nouns, profit is a hypernym of quick buck; that is, profit is a word with a broader meaning than quick buck:

quick buck: quick or easy earnings
profit: the excess of revenues over outlays in a given period of time (including depreciation and other non-cash expenses)

Other hypernyms of quick buck include earnings, lucre, net, net income, net profit, profits.

quick buck (noun)	profit (noun)
quick or easy earnings	the advantageous quality of being beneficial
	the excess of revenues over outlays in a given period of time (including depreciation and other non-cash expenses)

quick buck (verb)	profit (verb)
	make a profit; gain money or materially
	derive a benefit from