1. Upkeep
2. Repair
3. Care
4. Preservation
5. Overhaul
6. Checkup
7. Service
8. Renewal
9. Inspection
10. Overseeing
11. Custody
12. Refurbishment
13. Sustenance
14. Overseeing
15. Support
16. Upgrading
17. Sustentation
18. Supervision
19. Overseeing
20. Refitting
21. Refreshing
22. Fostering
23. Conservation
24. Improvement
25. Adjustment
26. Restoration
27. Overhauling
28. Monitoring
29. Overseeing
30. Renewing

Finding the best synonyms for the word «maintenance» can be a challenge. There are many options to choose from, but the key is to find the ones that best fit the context and the desired meaning. Whether it is for a business, a home, or something else, having the right synonyms can make all the difference. Some of the best ideas for synonyms for «maintenance» include upkeep, repair, care, preservation, overhaul, checkup, service, renewal, inspection, overseeing, custody, refurbishment, sustenance, support, upgrading, sustentation, supervision, refitting, refreshing, fostering, conservation, improvement, adjustment, restoration, overhauling, monitoring, renewing, and more. All of these words provide different ways to express the concept of maintenance, allowing you to communicate the desired meaning in a clear and concise way.