Countable Nouns That Start with R and End with US

Explore 40 verified English countable nouns starting with R and ending with US, including Religious, Radius, Rendezvous, Refocus, Ruckus, Rhombus and Rumpus. Sort these count nouns with singular and plural forms by word length for ESL grammar practice, determiner usage, and plural spelling below, or review singular and plural count rules in our noun grammar guide.

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Starts with RA5 words
radius
ranunculus
ramus
railbus
ramulus
Starts with RE10 words
religious
rendezvous
refocus
retrovirus
rebus
rectus
regulus
resus
retiarius
reovirus
Starts with RH12 words
rhombus
rhesus
rhinovirus
rhoncus
rhonchus
rhus
rhabdovirus
rhomboideus
rhamnus
rhinanthus
rhabdus
rhoicissus
Starts with RI4 words
rictus
ricinus
rivulus
risorius
Starts with RO
2 words
rotavirus
rosmarinus
Starts with RU6 words
ruckus
rumpus
rufous
rubus
rutilus
ruscus
Starts with RY
1 words
rypticus

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