For plants:
* Radicles: This is the technical term for the primary root of a plant.
* Taproot: This refers to the main, central root that grows straight down.
* Fibrous roots: A network of smaller roots that spread out horizontally.
* Underground stems: Some plants have underground stems that function like roots.
For ancestry:
* Lineage: This refers to a line of descent from an ancestor.
* Ancestry: This is the origin and development of a person or group.
* Heritage: This encompasses all the things that have been passed down from previous generations.
* Origins: This refers to where something comes from.
* Background: This is a broader term that encompasses a person's family, culture, and history.
For foundation:
* Base: This refers to the foundation or bottom of something.
* Foundation: This is the underlying structure or support of something.
* Basis: This is the fundamental principle or reason behind something.
To get a more accurate synonym, please provide more context. For example, are you talking about the roots of a tree, the roots of a language, or the roots of a problem?