gross margin vs profit margin

gross margin and profit margin both are nouns.

Word	Noun	Adjective	Verb	Adverb
gross margin	Yes	No	No	No
profit margin	Yes	No	No	No

As nouns, gross margin and profit margin are synonyms defined as:

gross margin and profit margin: the ratio gross profits divided by net sales

Other synonyms of gross margin include margin of profit.

gross margin (noun)	profit margin (noun)
the ratio gross profits divided by net sales	the ratio gross profits divided by net sales