As verbs the difference between retaining and preserving
is that retaining
is while preserving
As an adjective retaining
is of or pertaining to something that retains something else, as with a retaining wall.
As a noun preserving is
Of or pertaining to something that retains something else, as with a retaining wall.
* 1924 , Wilbur Olin Hedrick, The Economics of a Food Supply (page 26)
- Some preservings of foods, indeed, can scarcely be done to advantage except on a large scale.