General meaning of "adhere to":
* Follow: (more formal) - "Follow the rules"
* Obey: (more formal, implies authority) - "Obey the law"
* Comply with: (formal, emphasizing obedience) - "Comply with the regulations"
* Observe: (more neutral, emphasizing attention to something) - "Observe the instructions"
* Abide by: (formal, implying agreement) - "Abide by the agreement"
* Uphold: (formal, emphasizing support) - "Uphold the principles"
For specific situations:
* Stay with: (emphasizing staying in one place) - "Stay with the plan"
* Remain with: (similar to "stay with") - "Remain with the team"
* Persist with: (emphasizing continuing despite challenges) - "Persist with the project"
* Keep to: (emphasizing staying within limits) - "Keep to the budget"
* Hold to: (emphasizing holding onto something) - "Hold to your beliefs"
For "stick to" meaning "to be attached":
* Adhere to: (formal) - "The sticker adheres to the surface"
* Attach to: (more general) - "Attach the label to the package"
* Cling to: (implies a strong bond) - "The baby clings to its mother"
The best word will depend on the specific context and the nuance you want to convey.