More general:
* Model
* Framework
* Pattern
* Blueprint
* Outline
* Schema
* Format
* Structure
* Design
More specific:
* Prototype (if referring to a preliminary version)
* Skeleton (if emphasizing the basic structure)
* Mould (if referring to a physical template)
* Standard (if referring to a widely accepted template)
* Pre-made (if emphasizing that it's ready to use)
* Base (if emphasizing that it's a starting point)
More creative:
* Canvas (if emphasizing blank space for customization)
* Skeleton key (if emphasizing access and flexibility)
* Recipe (if referring to a process or formula)
To give you the best alternative, please tell me:
* What is the template for? (e.g., a document, a website, a project plan)
* What is the purpose of using the template? (e.g., to create something quickly, to follow a specific format, to ensure consistency)