guturagara (-turagaye)     v    1. to thunder, 2. to make a loud frightening noise
frighten    kudigiriza, gukānga, gutīnyīsha, gutēra ubwōba, kuvyigiriza
(away with shouting) kwāmira
(unintentionally) gukangīra
(to make a loud frightening noise) guturagara
En-En dictionary 
noise    urwamo
(loud, frightening) umuturagaro
(esp. of battle or strife) umuvurungano
(of earthquake, or approaching storm) umugigimo
(of rain, thunder) umuhīndo
(of wind, rain, running feet, etc.) igihīnda
(to make a big) kwāsana, kubomborana, kubugiriza, gusāma
(to make a lot) kuvurungana, kuyogora
(to make a loud frightening) guturagara
En-En dictionary 
thunder    umuturagaro, inkuba (refers to imaginary animal that makes the thunder)
(to ~) guturagara
(thunderstorm) ikivura
En-En dictionary