Yes
Luciferin is a compound that gives the fireflies, and any organism that has it, its light.
"Fireflies" by Owl City talks about "ten million fireflies," but also mentions "ten thousand lightning bugs. If you mean how many times the word "fireflies" is said in the song, it is said twice.
The word "fireflies" contains one instance of alliteration with the repeated "f" sound at the beginning of both syllables.
fireflies
No, building is not a compound word.
The contraction (not a compound word) is doesn't.
Upwards is a compound word.
There is no compound word.A compound word is a word like bus-stop.Husban is spelt like this husband
Upstairs is a compound word, so it is one word.
It cannot be a compound word.
Mango is not a compound word.
The compound word with "shield" in it is "shieldmaiden."