Words from
interstice
an intervening space, especially a very small one.
Source: My old website
interstitial
of, forming, or occupying interstices.
Source: My old website
prodigious
remarkably or impressively great in extent, size, or degree.
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impervious
unable to be affected by.
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countenance
a person's face or facial expression.
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exultant
triumphantly happy.
Source: My old website