trill (n.)
- anthem
- babble
- ballad
- bubble
- cackle
- call
- carol
- caw
- chant
- chatter
- cheep
- chirp
- chirrup
- choir
- chorus
- chuck
- clack
- cluck
- cock-a-doodle-doo
- coo
- croak
- crow
- cuckoo
- descant
- dribble
- drip
- drop
- drum
- falter
- flutter
- gabble
- gaggle
- gobble
- gurgle
- honk
- hoo
- hoot
- hum
- hymn
- lap
- leak
- lilt
- minstrel
- peep
- pip
- pipe
- plash
- psalm
- purl
- quack
- quaver
- quiver
- ripple
- roll
- roulade
- scold
- serenade
- shake
- sing
- splash
- squawk
- swash
- swish
- tremble
- tremolo
- tremor
- trickle
- trillo
- troll
- tweedledee
- tweet
- twit
- vibrato
- warble
- wash
- weep
- whistle
- yodel
trill (v.)
- babble
- bubble
- burble
- cackle
- call
- carol
- caw
- chant
- chatter
- cheep
- chirk
- chirp
- chirr
- chirrup
- chitter
- choir
- chorus
- chuck
- clack
- cluck
- coo
- croak
- cronk
- croon
- crow
- cuckoo
- descant
- distill
- dribble
- drip
- drop
- drum
- falter
- flutter
- gabble
- gaggle
- gobble
- guggle
- gurgle
- honk
- hoo
- hoot
- hum
- hymn
- intonate
- intone
- lap
- leak
- lilt
- minstrel
- peep
- pip
- pipe
- plash
- psalm
- purl
- quack
- quaver
- quiver
- ripple
- roll
- scold
- serenade
- shake
- sing
- slosh
- solmizate
- splash
- squawk
- swash
- swish
- tremble
- tremor
- trickle
- troll
- tweedle
- tweet
- twit
- vocalize
- warble
- wash
- weep
- whistle
- yodel
