noun
- microwave radar
- radio detection and ranging
- radiolocation
- measuring device
- measuring instrument
- measuring system
sounds kind of like
- radiator
- radyera
- raider
- rat terrier
- rather
- ratter
- raw weather
- reader
- ready-to-wear
- red deer
- red water
- red-header
- redheader
- reiter
- reorder
- retire
- retiree
- retro
- retry
- rewriter
- rider
- rioter
- roe deer
- rood-tree
- root hair
- rooter
- rotary
- rotatory
- rotor
- rotter
- router
- rudder
- rudra