What is the difference between Pentecostal and Anabaptist?

Answer 1

The word anabaptism is used in this article to describe any of the 16th century "radical" dissenters, and the denominations descending from the followers of Menno Simons. Today the descendants of the 16th century European movement (particularly the Baptists, Amish, Hutterites, Mennonites, and Brethren in Christ) are the most common bodies referred to as Anabaptist.

Several existing denominational bodies may be legitimately regarded as the successors of the Continental Anabaptists — Amish, Brethren, Hutterites, Mennonites, Bruderhof Communities and Quakers. Some writers prefer to distinguish institutionally lineal descendants (Amish, Hutterites, Mennonites) from the spiritual descendants Brethren, Church of the Brethren, the Bruderhof Communities, and Seventh-day Adventists. The Quakers are listed here only because they share the distinction of also being a peace church.

So the biggest difference is the speaking in tongues.

Answer 2

not much--same religion, different names