Grumbling
Part of speech: verb
Definition: To make a low, growling or rumbling noise, like a hungry stomach or certain animals.
Part of speech: noun
Definition: Complaining. Rumbling.
Example sentence: A lot of times, sets are not such fun places to be, and especially television sets, because everybody works so hard, and everybody's kind of grumbling about getting up at 3 o'clock in the morning and not getting home until midnight.
Complaining
Part of speech: verb
Definition: To express feelings of pain, dissatisfaction, or resentment.
Example sentence: The best thing is to accept the circumstances, not take them personally, deal with them, stop complaining, and give everything your best.