Reverse Dictionary: COMPANY (groups of people, animals, etc.)

NOUNS
1000 — WARD a company of watchmen or guards 
1350 — MUTE a pack of hounds → arch.
1350 — TORMENTRY a company or body of tormentors or executioners → obs.
1375 — YEOMANRY a company of yeomen → obs.
1450 — ABOMINABLE OF MONKS a crowd of monks → obs.
1450 — BUSINESS a group of ferrets 
1450 — MURMURATION a flock of starlings; a large gathering of starlings creating intricate patterns in flight
1450 — MUSTER a company or group of peacocks
1450 — PONTIFICAL a company of dignitaries, esp. of ecclesiastical dignitaries → obs.
1450 — SKULK a company or gathering of person or animals given to skulking, as a ‘skulk of foxes’, a ‘skulk of heretics’ → obs.
1450 — SPRING a flock of teal
1470 — GAGGLE a company of women → derisive usage
1470 — RAG an alleged name for a company of colts → obs.
1470 — SUIT a leash of hounds → obs.
1475 — MURDER a flock of crows
1476 — SMEAR a ‘company’ of curriers → obs.
1478 — BUSINESS a swarm of flies 
1486 — BERRY a company of rabbits → obs.
1486 — DRIFT a company of fishers → obs.
1486 HOST a ‘company’ of sparrows → obs.
1486 — KERF a company of pantrymen → obs., humorous usage
1486 — LAUGHTER an alleged name for a company of ostlers (men employed to look after the horses of people staying at an inn) 
1486 — NONPATIENCE an alleged term for a company of wives → obs.
1486 — PACE a company or herd of asses → obs.
1486 — PONTIFICALITY a company of prelates → obs.
1486 — RAGE an alleged name for a company of maidens → obs.
1486 — SUIT a flight of mallards → obs.
1486 — TABERNACLE an alleged term for a company of bakers → obs.
1486 — UNBREWING a company of carvers → obs.
1491 — HASTINESS a company of cooks → obs.
1548 — CUCKOLDRY a company of cuckolds → obs.
1669 — SATELLITIUM a company of planets → obs.
1801 — HUSKE a company of hares → obs.
1819 — DRAB a collector’s name for a group of moths 
1859 — RUSH a flock of pochard in flight
1859 — WALK a company of snipes 
1895 — SCHOOL a company of any kind of animals → Eng. dial. obs.
1983 — DERBY a group or pack of fox hounds → Amer. dial.