The word "chirm" means a mixture of loud and continuous noises made by a flock of birds. However, if you're writing a novel or a poem and want to avoid repetition, you might want to use synonyms instead. Here are some suggestions: twitter, warble, trill, chirp, cheep, peep, pipe, whistle, sing, hum, buzz, drone, rumble, murmur, chatter, babble, jabber, prattle, gabble. With these alternatives, you can create a more vivid and diverse description of the sounds that birds make. So, next time you're describing a flock of birds in your writing, consider using some of the suggested synonyms instead of the word "chirm".