Difference between Whitsunday and Pentecost

What is the difference between Whitsunday and Pentecost?

Whitsunday as a noun is the sunday of the feast of pentecost, seven weeks after easter, when traditionally many christians would be baptised, wearing white clothes while Pentecost as a noun is a jewish festival (also known as shavuot, the feast of weeks) seven weeks after the feast of firstfruits or yom habikkurim, originally a harvest festival but, since the destruction of the temple, also commemorating the anniversary of the giving of the ten commandments to moses and the israelites at mount sinai. [see wikipedia article on shavuot for further information on, and chronology of, these feasts.]

We hope you now know whether to use Whitsunday or Pentecost in your sentence.