1. Origin
2. Foundation
3. Source
4. Underpinning
5. Basis
6. Groundwork
7. Bottom
8. Primal
9. Stem
10. Substrate
11. Substratum
12. Basement
13. Embryo
14. Nucleus
15. Matrix
16. Subsoil
17. Bedrock
18. Substrata
19. Subterranean
20. Radix
21. Primitive
22. Pedestal
23. Subfloor
24. Subterrane
25. Substratum
26. Subterraneous
27. Primordial
28. Understructure
29. Subterrene
30. Subaqueous

When it comes to finding the best ideas for other words for “root”, there are many options available. Synonyms such as origin, foundation, source, underpinning, basis, groundwork, bottom, primal, stem, substrate, substratum, basement, embryo, nucleus, matrix, subsoil, bedrock, substrata, subterranean, radix, primitive, pedestal, subfloor, subterrane, substratum, subterraneous, primordial, understructure, subterrene, and subaqueous are all excellent alternatives to the word “root”. Whether you are looking for a single word or a phrase, these synonyms are sure to get your creative juices flowing and help you find the perfect word for your needs.