"Paperwork" is usually written as a single word.
The term is two words "white paper" for an official report or other document.
It is two words
I recommend class work, as two words.
Hard work is written as two separate words.
Although there are not references, the compound form would be one word, cornstock (paper).
work site Two words
"Work time" is written as two words.
No. It is two words which form a complex noun if you want to call it that, but because it is two words, it does not count as a complex word. It is much like paper weight. It is a weight for paper, and one noun, yes, but two words, and thus not a compound word.
one word
Work site, two words.
"Test work" is typically written as two separate words.
Two words. Lunch break.