In the HSpice manual, FN is "output flicker noise" and ID is "output thermal noise due to channel". The RD etc are due to drain resistance etc. Total is the sum of them all (straight arithmetic sum because they are all in volts squared per Hertz).
By the way, the information 'should' be in the manuals, but may not be easy to find. In pdf versions search for FN - it isn't a term that will appear in normal words.