A group of trees is called a wood
from which a forest area could be called a woodland.
Palm trees
A Latin prefix is how a word starts but usually a group of 3-4 letters. But the group of letters is from Latin.
The third group of Paul's letters contains four epistles: Ephesians, Colossians, Philippians, and Philemon.
bloc
Dove or Crow
Isle
Sire
Pixie - which is actually 5 letters.
trio
Quartet.
it is lath
it's a Glen