Select the most appropriate one-word substitution for the given group of words. 

High sounding pompous speech or writing 

Grandiloquent

The most appropriate one-word substitution for the given group of words is grandiloquent.

• Grandiloquent means using high-sounding or inflated language in a way that is intended to impress.
• Eloquent means using language effectively and expressively.
• Magniloquent means using language in a pompous or boastful way.
• Orator is a person who is skilled in public speaking.