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.
group
A group of witches is a coven.
well another word could be a party or a group
word abour
Paragraph
No it is not a compound word. It is not two separate words that are combined to make another word.