I spent some time reading the dictionary over the weekend and came up with the following list of words in which re- is used as an intensifier. If you would quibble you have ample opportunity with this list as most of them do not have corresponding re-less words.

rebel
rebuke
receive
recite
reconnoiter
record
recruit
recuse
redact*
refer
refine
refrigerate
refuge
refuse
regale
regard
regret
reinforce
relate
relax
relieve
rely
remain
remark
remedy
renegade/renege
repel
repine
repose
reprehend
repress
reprimand
reprove
repugn
require
research
resent
resist
resolve
retain
reveal
revere
revile
reward.

*In this case the prefix is red- but that is a Latin alternate where the d serves some phonetic function.