Part of a whole:
* Portion: This is a general term for a part of something.
* Piece: Similar to "portion," but often suggests a smaller, more easily defined part.
* Section: This implies a division or subdivision of a larger entity, often with a specific purpose.
* Component: This refers to a distinct part that contributes to the whole.
* Fragment: This implies a broken or incomplete part.
* Division: This implies a separation or partition of a larger whole.
Part of a line:
* Interval: This refers to the space between two points on a line.
* Span: This emphasizes the distance between two points.
Group within a larger population:
* Group: This is a general term for a collection of individuals.
* Subgroup: This implies a smaller group within a larger group.
* Market segment: This specifically refers to a group of customers with similar needs or characteristics.
Other:
* Slice: This often implies a thin, flat part.
* Strip: This suggests a long, narrow part.
Please provide more context for a more specific and accurate synonym.