Based on the clue 'a pompous person is one of these which sounds like...', what is the answer?

Based on the clue 'a polyglot one who speaks many languages can also ...', what is the answer? Based on the clue 'a polygon with 4 sides', what is the answer? What is referred to by 'a polygraph'? What is referred to by 'a pomapoo'? Based on the clue 'a ponticello is a little one of these found on a v...', what is the answer? Based on the clue 'a pony a feather macaroni are featured in the fir...', what is the answer? What is referred to by 'a poogle'? Based on the clue 'a poor couple window shopping a diamond bracelet a...', what is the answer?