manufacturing supervisor = noun phrase, consisting of a present participle (which functions as an adjective) and a noun
talented person = noun phrase, consisting of a past participle (which funcions as an adjective) and a noun
operations manager = noun phrase, consisting of two nouns, and the first noun functions as an adjective
"The only white people who came to our house were welfare workers and bill collectors."
1. Are all my stated claims OK?
2. Can the nouns in bold be called adjectives?