The term 'silly goose' is a phrase used to describe someone who is foolish or silly. It can be broken down into several other terms, such as 'MUTTONHEAD' (10 letters), which is an old-fashioned term for a stupid person; 'TWIT' (4 letters), which is a slang term for a silly or foolish person; 'ASS' (3 letters), which is a slang term for a foolish or stupid person; 'NINCOMPOOP' (10 letters), which is an old-fashioned term for a foolish or stupid person; 'GOOF' (4 letters), which is a slang term for a silly or foolish person; 'FLIBBERTIGIBBET' (15 letters), which is an old-fashioned term for a silly or flighty person; and 'NINNY' (5 letters), which is an old-fashioned term for a foolish or silly person. All of these terms are used to describe someone who is foolish or silly, and can be used interchangeably with the phrase 'silly goose'.