debut the occasion when someone performs or presents something to the public for the first time Example sentence : She ma d e her professional stage debut in Swan Lake . gadget a small device or machine with a particular purpose Example sentence: Have you seen this handy little gadget - it's for separating egg yolks from whites. morph to gradually change, or change someone or something, from one thing to another Example sentence: He grew up watching his elder brother Joe morph from a difficult to a drug addict. rival a person, group, etc. competing with others for the same thing or in the same area Example sentence :The companies produce rival versions of the toy. cutting-edge the most modern stage of development in a particular type of work or activity Example sentence : A company at the cutting-edge of mobile communications technology. niche a job or position