var objeto = {
"endeavour": "adeenoruv",
"listen": "eilnst",
"murder": "demrru",
"pore": "eopr",
"red rum": "demrru",
"repo": "eopr",
"rope": "eopr",
"silent": "eilnst"
}
var c = []
var b = {}
Object.keys(objeto).map(x=>{
if(b[objeto[x]]==undefined){
b[objeto[x]]=[]
c.push(b[objeto[x]])
}
b[objeto[x]].push(x)
})
console.log(c)