Using the word "return"

[Katherine]

Synonym Search, Intermediate level

ESL/EFL Test #121 "Synonyms for profit and benefit", question 10

One of the great ......... to the students when they go on a mountain walk is that they learn a lot about wild flowers.

(a) benefits
(b) returns
(c) supports
(d) profits

Synonym Search, Intermediate level

ESL/EFL Test #121 "Synonyms for profit and benefit", answer 10

One of the great benefits to the students when they go on a mountain walk is that they learn a lot about wild flowers.

Correct answer: (a) benefits

Your answer was: incorrect
One of the great returns to the students when they go on a mountain walk is that they learn a lot about wild flowers.
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Hello!

Could you, please, explaine when we are using the word "returns"?

Thanks in advance
Katherine

[Conchita]

'Return' can be used in the sense of 'profit' meaning the income from money invested:

Does the savings bank give you a good return on capital?