sales force vs sales department

sales force and sales department both are nouns.

Word	Noun	Adjective	Verb	Adverb
sales force	Yes	No	No	No
sales department	Yes	No	No	No

As nouns, sales force and sales department are synonyms defined as:

sales force and sales department: the division of a business that is responsible for selling products or services

Other synonyms of sales force include sales division.

sales force (noun)	sales department (noun)
the division of a business that is responsible for selling products or services	the division of a business that is responsible for selling products or services