Answer :
Vibrant means bright or colorful so a good hint is the word glorious, which is set to be similar to vibrant (so you can guess that they have similar meanings).
Answer:
Peawingspan, glorious
Explanation:
The word vibrant is defined as that which pulsates with life, vigor, or activity in a manner it causes awe.
This term has a relationship with the word glorious in the text, as they are both offered as options to "match the power of a falcon" and are used to describe feathers.
The peawingspan is nothing but a noun that complements a phrase, but the comparison between the words vibrant and glorious indicate they signify something in common: They both cause awe with the noun they describe.