To cull (from a herd, a selective separation, removing the old and injured)
split, splinter, fragment (implies a forced separation)
To distill (refining the group)
To isolate, segregate (as Jewish ghettos in WWII)
quarantine
another word for large group is clan.
separate
choir or orchestra is another word for music group
Detach.
another word for dividing is share, separate
Another word for gather or collect is... handle or group together.
Another word for religious group could be "faith community" or "religious organization."
Another word for study group is "learning circle" or "study session".
faction clique
The best way to quickly group individual letters into separate words is by looking for common patterns and word formations within the text. This principle is known as word segmentation and relies on identifying spaces or other indicators that separate one word from another. By recognizing these patterns, readers can efficiently parse text into its component words.
group
A group of witches is a coven.