In the US, coworker is normally not hyphenated. However in the UK, it is usually co-worker.
British English and U.S. English Hyphen Usage
There are some differences in the manner in which the hyphen is used in the United Kingdom and in the United States, although these differences actually are rather minimal. For example, in the UK certain prefixes will be hyphenated when they will not be so separated in the US. For another example, the word preschool in the US is hyphenated pre-school in the UK.
The word "coworker" is typically written as one word.
It is one word according to Webster dictionary. it is one word but it can be hyphenated it wanted to (Table-Cloth)
Yes it should be hyphenated: co-worker.
in-house - two words, hyphenated.
It should be hyphenated.
No it shouldn't be hyphenated. It is one word.
Hyphenated
It is a hyphenated adjective, life-giving.
Coordinate is one word.
"Reuse" is one word.
One-half is a hyphenated word. It begins with the letter O.
Yes, end-product is hyphenated. It is a noun and treated as one word which is hyphenated.
No, "wholeheartedly" is one word.