1. Exchange
2. Dialogue
3. Communication
4. Connection
5. Relationship
6. Engagement
7. Conversation
8. Interplay
9. Intercourse
10. Interchange
11. Rapport
12. Link
13. Exchange of ideas
14. Interaction with others
15. Interaction between people
16. Interaction among individuals
17. Interaction among groups
18. Interconnection
19. Interaction between cultures
20. Interaction with environment
21. Interaction with nature
22. Interaction with technology
23. Interaction with media
24. Interaction with computers
25. Interaction with social media
26. Interaction with the public
27. Interaction with the community
28. Interaction with society
29. Interaction with animals
30. Interaction with plants

When looking for different ways to express the concept of interaction, there are plenty of synonyms that can be used. From exchange and dialogue to conversation and interplay, there are many words that can be used to describe the same concept. Additionally, there are many phrases that can be used to describe the idea of interaction, such as interaction with others, interaction between cultures, and interaction with the environment. When looking for the best ideas to express the concept of interaction, these synonyms and phrases can be used to create a more varied and interesting sentence structure.