bouquet of flowers 

string串；挂；节

a string of beads/pearls/words/thread 

sheaf pl. sheaves 捆;束 

a sheaf of wheat/arrows/papers 

crew 帮；伙；全体 

a crew of sailors/pilots 

party 组；伙；批 

a party of guests/children... 

batch 批

a batch of letters/telegrams/visitors...

gaggle 群

a gaggle of geese/girls... 

litter 一窝

a litter of kittens/little piglets/puppies ... 

herd 群

a herd of elephants/deer/cattle... 

swarm 群

a swarm of ants/locusts/bees/people/stars...

cluster串；束；群；组

a cluster of flowers/grapes/bees/islands/stars...

a cluster of butterflies/ graphs/berries/consonants/ houses

brood窝；群；组

a brood of chickens/paintings/ thieves... 

school 群

a school of whales/dolphins... 

shoal 群 

a shoal of fish/whales/people... 

flock 群