IPA: //ˈmaʊntəˌbæŋkəri//
KK: /ˈmaʊntəˌbæŋkəri/
The actions or behaviors of a person who deceives others by pretending to have skills or knowledge they do not possess, often for personal gain.
His mountebankery was evident when he claimed to cure diseases without any medical training.
Mountebankery → It is formed from "mountebank" (from Italian *montimbanco*, meaning to mount a bench) and the suffix "-ery" (meaning a place or condition of). The term refers to the practice or condition of a mountebank, which is a person who deceives others, especially in selling quack medicines.
Think of a person who 'mounts a bench' to sell dubious remedies — that's what a mountebank does, and '-ery' indicates the practice or condition of it.
No commonly confused words.