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biomass |?b???mas|
noun
the total mass of organisms in a given area or volume.
• organic matter used as a fuel, esp. in a power station for the generation of electricity.

compost |?käm?p?st|noundecayed organic material used as a plant fertilizer.• a mixture of this with loam and/or other ingredients,used as a growing medium.verb [ trans. ]make (vegetable matter or manure) into compost : don't compost heavily infested plants.• treat (soil) with compost : we turned clay soil into almost workable soil by composting it.ORIGIN late Middle English : from Old French composte, from Latin composita, compositum ‘something put together,’ feminine and neuter past participle of componere.

There are a variety of methods for handling materials that will decay, rot, ignite and /or ferment. These methods often refer to their feed stock by different names but basically organic materials are termed biomass when the processing is oriented toward heat and steam production by reducing a feedstock to manageable size for automated feed into a furnace.