Using CRM but want to customise headings

Using CRM but want to customise headings

We are a hotel and are using Zoho CRM for our database, and are delighted with it.  However, we want to customise our headings i.e. leads - Individuals, Contacts - Tour Operators and also add a number of categories.  If we purchase Enterprise on the short term and customise the site, can we then revert to Zoho CRM as normal after a short period.