sales vs gross revenue

sales and gross revenue both are nouns.

Word	Noun	Adjective	Verb	Adverb
sales	Yes	No	No	No
gross revenue	Yes	No	No	No

As nouns, sales and gross revenue are synonyms defined as:

sales and gross revenue: income (at invoice values) received for goods and services over some given period of time

Other synonyms of sales include gross sales.

sales (noun)	gross revenue (noun)
income (at invoice values) received for goods and services over some given period of time	income (at invoice values) received for goods and services over some given period of time