There is no English word that meets the criteria, but there is one that ends with SAD: dorsad
tinier, retina, retain
All I know is that it is a 8 letter word and the 6letter word is i
factor,traced,tailor,afraid,direct,forced,detail
Well if the word has 4 letters and the last 3 are 'sod' the just go through the alphabet thus: asod,bsod,csod,dsod,esod,fsod,gsod,hsod,isod,jsod,ksod,lsod,msod,nsod,osod, psod,qsod,rsod,ssod,tsod,usod,vsod,wsod,xsod,ysod,zsod. (you could have done this yourself) The point is that having done this it is clear that none of the 4 letter words made (all those it is possible to make ending in 'sod') are not proper words. Therefore the IS NO 4-letter word ending in 'sod'.
cod, god, hod, mod, nod, pod, rod, sod, tod or yod
said is a 4 letter word beginning with s and ending with d
The 6letter word woth the second letter 'E' and the units for it is newtons is weight.
That saggiN (read it backwards) a sod.
The sod house was warm in the winter and cool in the summer. The workers will be here in the morning to sod the yard. (slang) He was a cantankerous old sod and seldom had a good word for anyone.
sod (סוד)
A sod.
The word "sod" is not vulgar if you're talking about the surface of the ground, it is vulgar when you refer it to an unpleasant or obnoxious person.