The difference between Firmament and Welkin
When used as nouns, firmament means the vault of the heavens, whereas welkin means the sky, the region of clouds.
check bellow for the other definitions of Firmament and Welkin
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Firmament as a noun (uncountable):
The vault of the heavens; the sky.
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Firmament as a noun (obsolete):
basis.
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Firmament as a noun:
The field or sphere of an interest or activity.
Examples:
"the international fashion firmament"
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Firmament as a noun (archaic):
In the geocentric Ptolemaic system, the eighth sphere, which carried the fixed stars.
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Welkin as a noun (archaic, poetic):
The sky, the region of clouds; the upper air; aether; the heavens.