buzz
noun
sound of rapid vibration
“the buzz of a bumble bee”
a confusion of activity and gossip
“the buzz of excitement was so great that a formal denial was issued”
verb
make a buzzing sound
“bees were buzzing around the hive”
fly low
“Planes buzzed the crowds in the square”
be noisy with activity
“This office is buzzing with activity”
call with a buzzer
“he buzzed the servant”
Source: WordNet 3.1, Princeton University