The term 'small part' can refer to a variety of different things. A FRACTION is an eighth of a whole, and can be used to describe a small part of something. A CAMEO is a brief appearance in a movie or other form of media, which can also be considered a small part. DETAIL is a small part of a larger picture, and an ATOM is the smallest particle of matter. A PIECE is a portion of something, and a CAMEO role is a minor role in a movie or other form of media. All of these terms can be used to describe a small part of something.