Answer: HUMS

Possible questions:


Bustles we know 5 Answers
Drones we know 4 Answers
Runs smoothly we know 2 Answers
Buzzes we know 6 Answers
Engine sounds we know 4 Answers
Joins in wordlessly we know 1 Answer
Sings without words we know 1 Answer
Is busy we know 1 Answer
Forgets the words, maybe we know 1 Answer
Runs well, as an engine we know 1 Answer
Is at a loss for words? we know 1 Answer
Is abuzz we know 2 Answers
Doesn't quite sing we know 1 Answer
Symptoms for a car mechanic we know 1 Answer
Sounds of a kind we know 1 Answer
Sings wordlessly we know 1 Answer
Sings with closed mouth we know 1 Answer
Sings with a closed mouth we know 1 Answer
Sings close-mouthed we know 1 Answer
Sings along without words we know 1 Answer
Really cooks we know 1 Answer
Plays a kazoo, basically we know 1 Answer
Operates smoothly we know 1 Answer
Keeps one's mouth shut? we know 1 Answer
Insect noises we know 1 Answer
Emulates a bumble bee we know 1 Answer
Close-mouthed singing we know 1 Answer
Buzzes along we know 1 Answer
Bombinates we know 1 Answer
Bee sounds we know 1 Answer
Ambient sounds we know 1 Answer

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