1.  obliteration(n = noun.act) annihilation - destruction by annihilating something;
is a kind of destruction, devastation
has particulars: atomisation, atomization, pulverisation, pulverization, vaporisation, vaporization
Derived forms verb obliterate₃, verb obliterate₄

2.  obliteration(n = noun.event) eradication - the complete destruction of every trace of something;
is a kind of demolition, destruction, wipeout
Derived forms verb obliterate₃, verb obliterate₄, verb obliterate₁

   The act of obliterating, or the state of being obliterated; extinction. Sir. M. Hale. [1913 Webster]

N  inexistence, nonexistence, nonsubsistence, nonentity, nil, negativeness, nullity, nihility, nihilism, tabula rasa, blank, abeyance, absence, no such thing, nonbeing, nothingness, oblivion, annihilation, extinction, extinguishment, extirpation, Nirvana, obliteration, inexistent, nonexistent, negative, blank, missing, omitted, absent, insubstantial, shadowy, spectral, visionary, unreal, potential, virtual, baseless, in nubibus, unsubstantial, vain, unborn, uncreated, unbegotten, unconceived, unproduced, unmade, perished, annihilated extinct, exhausted, gone, lost, vanished, departed, gone with the wind, defunct, fabulous, ideal, supposititious &c, negatively, virtually, non ens.

N  obliteration, erasure, rasure, cancel, cancellation, circumduction, deletion, blot, tabula rasa, effacement, extinction, obliterated, out of print, printless, leaving no trace, intestate, unrecorded, unregistered, unwritten, Int, dele, out with it!, delenda est Carthago.