genitive determiner (marker before a noun)— i.e., his name, her name, whose name, etc. See Determiner List.
genitive pronoun (takes the place of a noun) — i.e., It's his, her, ours, whose?, etc. See Genitive Determiner vs. Pronoun
successor (N) – person who follows (is next in line for) taking a job title or position.
whose (pronoun) – (1) possessive determiner for who. Whose dog is barking? (2) relative genitive pronoun: The man whose dog is barking is upset. (3) connective genitive pronoun: I don't know whose dog is barking. (4) something belonging to an unknown person. Whose is barking? (the noun "dog" is understood from context, earlier mention). See Comparison of Wh- Pronoun Uses.
"Teacher." By Kevin Dooley. Flickr, 14 Nov 2007. Licensed under CC BY 2.0. Accessed 31 May 2020.