Difference between "severe" and "strict"

Business English Lesson, Advanced Level

ESL/EFL Test #16 [color=blue]“At the Shops”, question 8

They’re quite in their policy of not giving refunds without a receipt in this store.

(a) severe
(b) strong
(c) strict
(d) hard

Business English Lesson, Advanced Level

ESL/EFL Test #16 [color=blue]“At the Shops”, answer 8

They’re quite strict in their policy of not giving refunds without a receipt in this store.

Correct answer: (c) strict
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Can you explain the difference between “severe” and “strict”, please?

Thank you

Severe – Intensely or extremely bad or unpleasant in degree or quality

“severe pain”; “a severe case of flu”

www.thefreedictionary.com/severe

Strict – Rigidly accurate; allowing no deviation from a standard

“a strict vegetarian”

www.thefreedictionary.com/strict