Pre-polishing is likely a hyphenated word.
The word "highlights" is one word.
One, it's a compound word.
It is one word.
one word
One word. 'Sandstorm.'
"Everyone" is one word.
Yes, daylight is one word!
Campfire is one word.
one word
its word that means one
The word "underemployed" is typically written with no spaces or hyphens as one word.
Yes, "schoolchildren" is one word.