Yes, Zoho maintains a full reference of every standard field across each standard module, including field names, descriptions, data types, and character or numeric limits.
Zoho CRM's standard modules include Leads, Accounts, Contacts, Deals, Campaigns, Forecasts, Cases, Solutions, Products, Price Books, Quotes, Invoices, Vendors, Purchase Orders, Sales Orders, Tasks, Dashboards, Documents, Calls, and Meetings, each with its own dedicated standard field list in Zoho's help documentation.
Because standard field lists and limits are occasionally revised, the most reliable source is Zoho's own "Standard Modules and Fields" help documentation, which is kept current and broken down module by module, showing each field's name, description, data type (text box, pick list, lookup, and so on), and its maximum length or numeric limit where applicable.
If you're building an integration, the Zoho CRM REST API's Modules endpoint lets you retrieve the full list of available modules programmatically, and each module's own fields metadata endpoint returns its complete field list, including the internal api_name used to reference each field in code. This is generally the most reliable source if you need field details in a machine-readable format rather than reading through documentation manually.