Industry-specific is a compound noun or different grammatical structure?

Business English Lesson, Advanced Level

ESL/EFL Test #143 [color=blue]“Job Advertising”, question 1

Industry- , or niche, employment websites are proliferating as places for companies to locate qualified personnel.

(a) controlled
(b) only
(c) particular
(d) specific

Business English Lesson, Advanced Level

ESL/EFL Test #143 [color=blue]“Job Advertising”, answer 1

Industry- specific, or niche, employment websites are proliferating as places for companies to locate qualified personnel.

Correct answer: (d) specific

Your answer was: [color=red]incorrect
Industry- particular, or niche, employment websites are proliferating as places for companies to locate qualified personnel.
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Can you explain Industry-specific is a compound noud or different grammatical structure, please?

Thank you

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It is not a compound noun, since the second component (‘specific’) is an adjective. I can think of nothing better to call it than a hyphenated adjective with a noun as prefix.
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