profit vs cash in on

profit is a noun but cash in on is not a noun.

Word	Noun	Adjective	Verb	Adverb
profit	Yes	No	Yes	No
cash in on	No	No	Yes	No

As verbs, cash in on is a hyponym of profit; that is, cash in on is a word with a more specific, narrower meaning than profit:

Other hyponyms of profit include profiteer, capitalise, capitalize, take advantage, pyramid, clear, net, sack, sack up.

profit (noun)	cash in on (noun)
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)

profit (verb)	cash in on (verb)
make a profit; gain money or materially	take advantage of or capitalize on
derive a benefit from