margin vs safety margin

margin and safety margin both are nouns.

Word	Noun	Adjective	Verb	Adverb
margin	Yes	No	No	No
safety margin	Yes	No	No	No

As nouns, safety margin is a hyponym of margin; that is, safety margin is a word with a more specific, narrower meaning than margin:

Other hyponyms of margin include margin of error, margin of safety, narrow margin, narrowness, slimness.

margin (noun)	safety margin (noun)
an amount beyond the minimum necessary	the margin required in order to insure safety
a permissible difference; allowing some freedom to move within limits
the blank space that surrounds the text on a page
the amount of collateral a customer deposits with a broker when borrowing from the broker to buy securities
(finance) the net sales minus the cost of goods and services sold
the boundary line or the area immediately inside the boundary