- refrigerator car
- refrigerator-freezer
- refringence
- refringent
- reft
- refudiate
- refuel
- refuge
- refugee
- refugee capital
- refugees
- refugium
- refulgent
- refund
- refund annuity
- refurb
- refurbish
- refusal
- refuse
- refusenik
- refutable
- refutation
- refutative
- refute
- reg
- reg.
- regain
- regal
- regal moth
- regale
- regalia
- regality
- regard
- regardant
- regardful
- regarding
- regardless
- regatta
- regd
- regd.
- regelate
- regelation
- regency
- regeneracy
- regenerate
- regeneration
- regenerative
- regenerative braking
- regenerative cooling
- regenerative furnace
- regenerative medicine
- regenerator
- regent
- regent bowerbird
- regent honeyeater
- reggae
- reggaeton
- regicide
- regift
- regime
- regime change
- regimen
- regiment
- regimental
- regimental sergeant major
- regimentals
- regimentation
- regina
- region
- regional
- regional enteritis
- regional metamorphism
- regionalism
- regionalize
- register
- register mark
- register of wills
- register office
- register ton
- register tonnage
- registered
- registered bond
- registered dietitian
- registered disabled
- registered mail
- registered nurse
- registered post
- registered representative
- registrant
- registrar
- registrate
- registration
- registration document
- registration number
- registration plate
- registry
- registry office
- regius
- regle
- reglet
- regma
- regmaker
- regnal
- regnant
- regnat populus
- rego
- regolith
- regorge
- regosol
- regr.
- regrate
- regreet
- regress
- regression
- regression analysis
- regressive
- regressive assimilation
- regressive tax
- regret
- regretful
- regrettable
- regrettably
- regroup
- regrow
- regrowth
- regt.
- regula
- regulable
- regulant
- regular
- regular as clockwork
- regular bevel
- regular checking account
- regular flower
- regular guy
- regular lay
- regular tertiaries
- regular verb
- regularize
- regularly
- regulate
- regulated tenancy
- regulation
- regulator
- regulator pin
- regulatory
- regulatory gene
- regulatory risk
- reguline
- regulo
- regulus
- regurgitate
- regurgitation
- rehab
- rehabilitant
- rehabilitate
- rehabilitation
- rehash
- rehearing
- rehearsal
- rehearse
- reheat
- reheating
- rehire
- rehoboam
- rehome
- rehouse
- rehydrate
- reichsmark
- reichspfennig
- reichsthaler
- reif
- reification
- reify
- reign
- reignite
- reiki
- reimagine
- reimburse
- reimbursement
- reimplant
- reimplantation
- reimport
- reimpose
- reimpression
- rein
- rein in
- reincarnate
- reincarnation
- reindeer
- reindeer moss
- reindustrialization
- reindustrialize
- reinfect
- reinforce
- reinforced concrete
- reinforced plastic
- reinforcement
- reinforcement therapy
- reins
- reinsman
- reinstall
- reinstate
- reinstatement
- reinsurance
- reinsure
- reintegrate
- reintegration
- reinterpret
- reintroduce
- reinvent
- reinvent the wheel
- reinvest
- reinvestigate
- reinvigorate
- reis
- reissue
- reiterant
- reiterate
- reiterated
- reiteration
- reive
- reject
- rejectamenta
- rejectee
- rejection
- rejection region
- rejection slip
- rejectionist
- rejective art
- rejig
- rejigger
- rejoice
- rejoice in
- rejoicement
- rejoicing
- rejoin
- rejoinder
- rejuvenate
- rejuvenation
- rejuvenesce
- rejuvenescent
- rejuvenize
- rekey
- rekindle
- rekt
- rel.
- rel. pron.
- reladle
- relapse
- relapsing fever
- relata
- relatability
- relatable
- relate
- related
- relatedness
- relation
- relational
- relational database
- relations
- relationship
- relationship marketing
- relative
- relative aperture
- relative atomic mass
- relative bearing
- relative clause
- relative complement
- relative density
- relative deprivation
- relative frequency
- relative humidity
- relative impediment
- relative major
- relative majority
- relative minor
- relative molecular mass
- relative permeability
- relative permittivity
- relative pitch
- relative pronoun
- relative temperature scale
- relative to
- relative topology
- relative wind
- relatively
- relatively prime numbers
- relativeness
- relativism
- relativist
- relativistic
- relativistic mass
- relativistic quantum mechanics
- relativity
- relativize
- relator
- relatum
- relaunch
- relax