noncombustible vs combustible incombustible

from The Collaborative International Dictionary of English v.0.48
nonflammable \nonflammable\ adj.
   Not easily ignited, and burning only slowly if ignited.
   [Narrower terms: {noncombustible (vs. combustible),
   incombustible}] WordNet 1.5]
from The Collaborative International Dictionary of English v.0.48
nonexplosive \nonexplosive\ adj.
   Not explosive. [Narrower terms: {noncombustible (vs.
   combustible), incombustible}] WordNet 1.5]
from The Collaborative International Dictionary of English v.0.48
fire-resistant \fire-resistant\ fire-resisting \fire-resisting\
fire-resistive \fire-resistive\adj.
   Not able to burn or able to burn only with difficulty.
   [Narrower terms: {noncombustible (vs. combustible),
   incombustible}]

   Syn: fireproof.
        [WordNet 1.5]
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