masquerade

(noun) a party of guests wearing costumes and masks. Synonyms: masquerade party, masque, mask.

(noun) a costume worn as a disguise at a masquerade party. Synonyms: fancy dress, masquerade costume.

(noun) making a false outward show. Example: "A beggar's masquerade of wealth."

(verb) take part in a masquerade.

(verb) pretend to be someone or something that you are not. Examples: "He is masquerading as an expert on the internet." "This silly novel is masquerading as a serious historical treaty."