престолонаследник betyr engelsk

crown prince▼(next king)
noun
[UK: ˈkraʊn.ˈprɪns] [US: ˈkraʊn.ˈprɪns]

heir apparent [heirs apparent]▼(someone who will definitely inherit)
noun
[UK: eə(r) ə.ˈpæ.rənt] [US: ˈer ə.ˈpe.rənt]