What's the difference between drum and grum?

Drum

Definition:

(n.) An instrument of percussion, consisting either of a hollow cylinder, over each end of which is stretched a piece of skin or vellum, to be beaten with a stick; or of a metallic hemisphere (kettledrum) with a single piece of skin to be so beaten; the common instrument for marking time in martial music; one of the pair of tympani in an orchestra, or cavalry band.
(n.) Anything resembling a drum in form
(n.) A sheet iron radiator, often in the shape of a drum, for warming an apartment by means of heat received from a stovepipe, or a cylindrical receiver for steam, etc.
(n.) A small cylindrical box in which figs, etc., are packed.
(n.) The tympanum of the ear; -- often, but incorrectly, applied to the tympanic membrane.
(n.) One of the cylindrical, or nearly cylindrical, blocks, of which the shaft of a column is composed; also, a vertical wall, whether circular or polygonal in plan, carrying a cupola or dome.
(n.) A cylinder on a revolving shaft, generally for the purpose of driving several pulleys, by means of belts or straps passing around its periphery; also, the barrel of a hoisting machine, on which the rope or chain is wound.
(n.) See Drumfish.
(n.) A noisy, tumultuous assembly of fashionable people at a private house; a rout.
(n.) A tea party; a kettledrum.
(v. i.) To beat a drum with sticks; to beat or play a tune on a drum.
(v. i.) To beat with the fingers, as with drumsticks; to beat with a rapid succession of strokes; to make a noise like that of a beaten drum; as, the ruffed grouse drums with his wings.
(v. i.) To throb, as the heart.
(v. i.) To go about, as a drummer does, to gather recruits, to draw or secure partisans, customers, etc,; -- with for.
(v. t.) To execute on a drum, as a tune.
(v. t.) (With out) To expel ignominiously, with beat of drum; as, to drum out a deserter or rogue from a camp, etc.
(v. t.) (With up) To assemble by, or as by, beat of drum; to collect; to gather or draw by solicitation; as, to drum up recruits; to drum up customers.

Example Sentences:

(1) Eye movements which were either complementary or in opposition to the induced vestibular nystagmus were produced with an optokinetic drum.
(2) Over the same period, breeding in drums dropped from 14%-25% to 4.7%, even though the drums were not treated or covered.
(3) Out of the seabird whoops and thrashing drumming of the intro to Endangered Species come guitar-sax exchanges that sound like Prime Time’s seething fusion soundscapes made illuminatingly clearer.
(4) A philosophy student at Sussex University, he was part of an improvised comedy sketch group and one skit required him to beatbox (making complex drum noises with your mouth).
(5) The frequency of OKN was also decreased, and the total deviation of the eyes was reduced for OKN induced by these drum speeds.
(6) "A new generation picking up guitars and drums and saying, 'I'm here!
(7) It’s drummed into us from the first day of medical school: “First, do no harm.” We can do without tepid, faux-conflicted advice from the likes of Sir Bruce Keogh, medical director of the NHS.
(8) The hydrolysate obtained was then subjected to two different dehydration techniques: drum drying at 121 degrees C and 18 seconds retention, and spray drying at 101 degrees C and 40 psi pressure.
(9) I've danced and I still want to dance," he said over the noise of drumming and honking cars.
(10) 5.55pm BST Can you hear the drums of doubt Fernando?
(11) Critical verdict The Tin Drum catapulted Grass to the forefront of European fiction and since then he has been Germany's "permanent Nobel candidate"; of the remainder of the Danzig trilogy, Cat and Mouse is the best regarded.
(12) Lee sang, tap-danced and did comic turns before settling on the drums.
(13) Reitzell, who drums with Air, warns me during my nail-biting wait that Shields tends to work all night and sleep all day and never answers his phone.
(14) She was then a little known singer-songwriter whose career was about to take off, and in a small London studio Mumford recorded the drum track for Marling's breakthrough album, Alas I Cannot Swim .
(15) Boys from King Edward VI grammar school will lay oblations inside Holy Trinity church, while the Coventry Corps of Drums prepares to lead a "people's parade" towards Bancroft Gardens, where the River Avon widens, and where – if you're lucky – you might see a swan or two cruise by.
(16) Pro-China groups had been told they could not use drums to try to drown out rights activists .
(17) Overall, it's an attempt to portray most of a continent (and if you refer to his original speech , Pakistan as well) as an undifferentiated mass of uncivilised people who have just enough sophistication to rip us off by spending our money on sunglasses, but otherwise are happy with their drums.
(18) I am very clear that I want to ensure we get the best possible deal for the United Kingdom that works for everyone across the United Kingdom and all parts of the UK when we enter these negotiation,” said the prime minister in Wales, at the start of a whirlwind UK tour aimed at drumming up last-minute support from the devolved administrations.
(19) An endorsement like that goes a long way in Atlanta, and the rapper talked about Sanders’s civil rights background, calling him “a drum major for justice”.
(20) Thus, in the case of foaming capacity, losses ranging from 17% to 34% were detected in the drum-dried hydrolysate, and of 38% to 49% in the hydrolysate dehydrated using a spray drier, during the first two months of storage.