As nouns the difference between foodstuff and improver
is that foodstuff is an instance of material which may be used as food while improver is something that, or someone who, improves.
foodstuff
English
Noun
(
en noun)
An instance of material which may be used as food.
improver
English
Noun
(
en noun)
Something that, or someone who, improves
A substance added to cause improvement (especially to a foodstuff)