line of business vs line of products

line of business and line of products both are nouns.

Word	Noun	Adjective	Verb	Adverb
line of business	Yes	No	No	No
line of products	Yes	No	No	No

As nouns, line of business and line of products are synonyms defined as:

line of business and line of products: a particular kind of product or merchandise

Other synonyms of line of business include business line, line, line of merchandise, product line.

line of business (noun)	line of products (noun)
a particular kind of commercial enterprise	a particular kind of product or merchandise
a particular kind of product or merchandise