oil industry vs industry

oil industry and industry both are nouns.

Word	Noun	Adjective	Verb	Adverb
oil industry	Yes	No	No	No
industry	Yes	No	No	No

As nouns, industry is a hypernym of oil industry; that is, industry is a word with a broader meaning than oil industry:

oil industry: an industry that produces and delivers oil and oil products
industry: the people or companies engaged in a particular kind of commercial enterprise

oil industry (noun)	industry (noun)
an industry that produces and delivers oil and oil products	the organized action of making of goods and services for sale
	persevering determination to perform a task
	the people or companies engaged in a particular kind of commercial enterprise