turn a profit vs earn

turn a profit and earn both are verbs.

Word	Noun	Adjective	Verb	Adverb
turn a profit	No	No	Yes	No
earn	No	No	Yes	No

As verbs, earn is a hypernym of turn a profit; that is, earn is a word with a broader meaning than turn a profit:

turn a profit: make a profit; gain money or materially
earn: earn on some commercial or business transaction; earn as salary or wages

Other hypernyms of turn a profit include bring in, clear, gain, make, pull in, realise, realize, take in.

turn a profit (verb)	earn (verb)
make a profit; gain money or materially	earn on some commercial or business transaction; earn as salary or wages
	acquire or deserve by one's efforts or actions