specialiser specialiser /ˈspɛʃəˌlaɪzər/

noun

1. [British] An expert who is devoted to one occupation or branch of learning  ( specialiser [British] , specializer , specialist )
   an expert who is devoted to one occupation or branch of learning
     The medical specialist focused on a specific area of expertise, providing specialized care.
   The medical specialist focused on a specific area of expertise, providing specialized care.
   
   

 Ipsus Ipsus /ˈɪpsəs/

noun

1. A battle between the successors of Alexander the Great (301 BC); Lysimachus and Seleucus defeated Antigonus and Demetrius  ( battle of Ipsus , Ipsus )
   a battle between the successors of Alexander the Great (301 BC); Lysimachus and Seleucus defeated Antigonus and Demetrius
   
   

 Otto Jespersen Otto Jespersen /ˈɔtoʊ ˈjɛspərsən/

noun

1. Danish linguist (1860-1943)  ( Jens Otto Harry Jespersen , Jespersen , Otto Jespersen )
   Danish linguist (1860-1943)
   
   

 emcee emcee /ˈɛmˈsiː/

noun

1. [ N. American] A person who acts as host at formal occasions (makes an introductory speech and introduces other speakers)  ( emcee [ N. American] , master of ceremonies , host )
   a person who acts as host at formal occasions (makes an introductory speech and introduces other speakers)
    The host gracefully introduced each guest speaker at the event.
   The host gracefully introduced each guest speaker at the event.
   
   

verb

1. [ N. American] Act as a master of ceremonies  ( compere [British] , emcee [ N. American] , compère )
   act as a master of ceremonies