buzzard (n.) Look up buzzard at
c. 1300, "type of hawk not used in falconry," from Old French buisart "harrier, inferior hawk," from buson, buison, apparently from Latin buteonem (nominative buteo) a kind of hawk ("but the process of formation is not evident" - OED), perhaps with -art suffix for one that carries on some action or possesses some quality, with derogatory connotation (see -ard). In the New World extended to the American vulture (by 1830s). De Vaan says buteo is "Probably onomatopoeic, rendering the call of a hawk or buzzard."