R: r-req | res-ru

radiation
random
randomization
randomized
range
rank
ranking
rate
rating
ratio
ration:
rationale
reaction
readability
reader:
re-adjusted
realign
realignment
reality
reality-based
realization
realm:
real-world
reason
reasoning
reassessment
reassurance
reassure
recalculate
recalibration
recall
receipt
receiver:
re-certification
recess
recipient
reciprocity
reclamation
recognition
recommendation
recommissioning
reconfirmation
record
record-keeping
recruiting
rectify
recurrence
recycling
redesign
redress
reduction
redundancy
redundant
reengineer
reengineering
re-evaluation
referral
reference
refine
refinement
reflection
reform
reformulation
region
Register:
register
registrar
registration
re-grade
regression
regulation
regulator
reimburse
reimbursement
re-inspection
reinvent
re-issue
reiterate
reject
rejection
relation
relationship
release
relevance
reliability
reliance
remanufacturer
remediation
remedy:
removal
renewable
renewal
reorganizer
repair
repeatability
repetition
replacement
replenishment
replication
report
reporting
representation
representative
reprocessing
reproducibility
reproducible
reproduction
repurchase
reputation
request
request
requester
requirement