Could they perhaps be interpolated to some extent from the Adūnaic where an existing Westron word could not be found?
These pages might be helpful, they have a decent collection of known words in various vocabularies:
http://folk.uib.no/hnohf/westron.htm
http://folk.uib.no/hnohf/adunaic.htm
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"Since the evening of that day we have journeyed from the shadow of Tol Brandir."
"On foot?" cried Éomer.
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