Visa Exempt entry is for people from countries such as the UK, USA, Australia, France, Germany, etc.
Visa on Arrival (VOA) is for citizens of countries such as India, Pakistan, etc.
The VOA gives 15 days on entry, costs 2,000 baht and was stopped when Covid erupted, may be restarted soon (maybe!!).
There is no such thing as 'Visa on Entry'.