service industry vs industry

service industry and industry both are nouns.

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

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

service industry: an industry that provides services rather than tangible objects
industry: the people or companies engaged in a particular kind of commercial enterprise

service industry (noun)	industry (noun)
an industry that provides services rather than tangible objects	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