the bright sun is shineing
"Very" is the only adverb in that sentence. It is modifying the adjective "bright".
no
The wet sidewalk glistens in the bright lights from the windows of stories.
"It is as bright as it could" is not a complete sentence. To make it a complete sentence, it would have to say "It is as bright as it could be". Furthermore, it is very difficult to rhyme with an entire sentence, and usually isn't necessary. Usually it is only necessary to rhyme with the last word in the sentence.
"The sun is never too bright at the north pole". "Charlie is a bright kid"
You just did! What a bright person you are. I bet you are up at dawn, just as the day gets bright, to study.
the lumen is bright
Both uniform (meaning the same size) and bright might be adjectives, depending on the sentence. In a sentence talking about bright buttons, it is more likely that the word uniform is a noun (clothing).
The bright star lit up the night sky.
The nouns in the sentence are sun and glasses.
The young man was as bright as a silver button.
When dresses have sequins they look bright.