Reopen.
reopen
re-implement
"Reassessment" is the correct spelling. It is spelled as one word.
re-emergence
Rethink
I can reassure you that this is the correct spelling.
Re-arrested
re x-ray
The correct spelling for the term meaning to resend something in the post is "resent."
re-energize
Rearrange is correct.
That is the correct spelling of "rehireable" (able to be rehired, or re-employed).