1) Echoic 2) Onomatopoeic 3) Onomatopoeical 1) Like buzz and whir 2) Onomatopoeic 3) Rhetorical device 
• (a.) Of or pertaining to onomatopoeia; characterized by onomatopoeia; imitative; as, an onomatopoetic writer or word.
On`o·mat`o·po·et'ic adjective Of or pertaining to onomatopœia; characterized by onomatopœia; imitative; as, an onomatopoetic writer or word. Earle. 
onomatopoetic 1. Of or relating to or characterized by onomatopoeia. 2: A reference to words that are formed in imitation of natural sounds.