A Group of -- is called a --
For future reference. If / when I upload all mentioned cultures, this will be deleted.
Aaracokra / Kenku / Owlin - 'Flock"
Aasimar - "Bevy"
Centaur - "Fare"
Changelings - "Cast"
Dragonborn - "Bale"
Dwarves - "Trestle"
Duergar - "Troop"
Elves / Half-Elves - "Swarm"
Dark Elves - "Sleuth"
Drow - "Cauldron"
High Elves - "Kitsch"
Moon Elves - "Husk"
Sea Elves - "Shoal"
Sun Elves - "Army"
Wood Elves - "Copse"
Firbolg - "Kine"
Genasi - "Amalgam"
Air Genasi - "Gust"
Earth Genasi - "Span"
Fire Genasi - "Flare"
Water Genasi - "Raft"
Gnoll - "Cackle" or "Pack"
Gnomes - "Gaggle" or "Skein"
Deep Gnomes - "Brace"
Forest Gnomes - "Fesnyng"
Rock Gnomes - "Tiding"
Goblinoid - "Colony"
Goliath - "Thunder"
Halflings - "Kettle"
Humans - "Pack"
Kobolds - "Clutch"
Lizardfolk - "Bask"
Minotaur - "Band"
Orcs / Half-Orcs - "Drove" or "Caravan"
Tabaxi - "Clutter"
Tieflings - "Kindle"
Yuan-Ti - "Brood"