Ash according to warmoth:
Ash
Northern Hard Ash is very hard, heavy and dense. A Strat® body will normally weigh 5 lbs. and up. Its density contributes to a bright tone and a long sustain which makes it very popular. Its color is creamy, but it also tends to have heartwood featuring pink to brown tints. The grain pores are open and it takes a lot of finish to fill them up.
Swamp Ash
Swamp Ash is a prized wood for many reasons. It is a fairly light weight wood which makes it easily distinguishable from Hard Ash. A Strat® body will normally weigh under 5 lbs. Many of the 50's Fenders were made of Swamp Ash. The grain is open and the color is creamy. This wood is a very nice choice for clear finishes. Swamp Ash is our second most popular wood. It is a very musical wood offering a very nice balance of brightness and warmth with a lot of "pop".