As nouns the difference between grumbler and grumbles
is that grumbler is a person who persistently grumbles; a complainer while grumbles is .
As a verb grumbles is
(grumble).
grumbler
English
Noun
(
en noun)
A person who persistently grumbles; a complainer
grumbles
English
Noun
(head)
Verb
(head)
(grumble)