A degasser is a more general term applied to any vessel that removes a gas phase from a liquid phase, it can be a simple separator, it can be a vessel with specialized internals, it can be a sulphur degasser where N2 is bubbled through molten sulphur to remove H2S, or any number of other services. A deaerator is more specifically defined as a vessel used to remove oxygen from boiler feed water prior to it going to the boiler.
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