Caw

Etymology
Onomatopoeic

Noun

 * 1) The harsh cry of a crow.

Verb

 * 1) Of a crow, to make its cry.

Thesaurus
belch, blare, blat, bray, burr, buzz, cackle, call, carol, chatter, cheep, chirk, chirp, chirr, chirrup, chitter, chuck, clack, clang, clangor, clank, clash, cluck, cock-a-doodle-doo, coo, craunch, croak, cronk, crow, crump, crunch, cuckoo, drum, gabble, gaggle, gobble, grind, groan, growl, grumble, guggle, honk, hoo, hoot, jangle, jar, peep, pip, pipe, quack, rasp, roll, scold, scranch, scrape, scratch, scrunch, sing, snarl, snore, squawk, trill, twang, tweet, twit, twitter, warble, whistle, yawp