muerte
/ˈmweɾte/ · A1 · noun · f
death
💀 muerte ~ mortal, mortuary: Latin mors/mortem, with o stretched to ue
Latin mortem gave English mortal, mortuary and post-mortem. In Spanish the stressed o broke into ue, the same shift as porta > puerta and forte > fuerte. Swap ue back to o and you get mort-, the death root you already know.