"products manager" is acceptable as someone's job description if they manage several products. However, the plural is not necessary; you could also call them "product manager". "documents flow" is awkward (assuming "flow" is intended as a noun).
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iasadih Is it correct to use plural, as in the title? In what cases?A noun that modifies another noun is almost always in the singular. Consistent with this general principle, occurrences of "product manager" and "document flow" are much more frequent than "products manager" and "documents flow". Occasionally a version with the plural becomes widespread eve