gross sales vs sales

gross sales and sales both are nouns.

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

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

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

Other synonyms of gross sales include gross revenue.

gross sales (noun)	sales (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