grumble vs plain

grumble and plain both are nouns.

Word	Noun	Adjective	Verb	Adverb
grumble	Yes	No	Yes	No
plain	Yes	Yes	Yes	Yes

As verbs, plain is a hypernym of grumble; that is, plain is a word with a broader meaning than grumble:

Other hypernyms of grumble include complain, kick, kvetch, quetch, sound off.

As verbs, plain is a hypernym of grumble; that is, plain is a word with a broader meaning than grumble:

Other hypernyms of grumble include complain, kick, kvetch, quetch, sound off.

grumble (noun)	plain (noun)
a complaint uttered in a low and indistinct tone	a basic knitting stitch made by putting the needle through the front of the stitch from the lefthand side
a loud low dull continuous noise	extensive tract of level open land

grumble (adjective)	plain (adjective)
	not elaborate or elaborated; simple
	lacking patterns especially in color
	free from any effort to soften to disguise
	clearly revealed to the mind or the senses or judgment
	not mixed with extraneous elements
	lacking embellishment or ornamentation
	lacking in physical beauty or proportion

grumble (verb)	plain (verb)
make complaining remarks or noises under one's breath	express complaints, discontent, displeasure, or unhappiness
show one's unhappiness or critical attitude
to utter or emit low dull rumbling sounds
make a low noise

grumble (adverb)	plain (adverb)
	unmistakably (`plain' is often used informally for `plainly')