Vertex vs. vortex
Vertex: 1. the highest point; 2. the point at which two sides of an angle intersect. Vortex: a whirling mass of matter.
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Doubtlessly
It always bears replacement with doubtless, which functions as an adverb (in addition to being an adjective) by convention.
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Impending vs. pending
Pending: awaiting conclusion or in the process of being completed. Impending: soon to occur.
