gruñir
/ɡɾuˈɲiɾ/ · B2 · verb
to grunt
🐻 gruñir = sounds like 'groon-YEER', a grumpy growl rumbling out
The gru- start mimics a low growl, close to English 'grunt' and 'grumble'. Say gruñir with a rumbling throat and the sound itself matches the meaning: a bear or a grumpy person growling.