The difference between Bed and Tray
When used as nouns, bed means a piece of furniture, usually flat and soft, for resting or sleeping on. a prepared spot to spend the night in. one's place of sleep or rest. sleep, whereas tray means a small, typically rectangular or round, flat, and rigid object upon which things are carried.
When used as verbs, bed means senses relating to a bed as a place for resting or sleeping. to go to a bed. to place in a bed. to put oneself to sleep. to furnish with a bed or bedding. to have sexual intercourse with, whereas tray means to place (items) on a tray.
check bellow for the other definitions of Bed and Tray
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Bed as a noun (usually after a preposition):
A piece of furniture, usually flat and soft, for resting or sleeping on. A prepared spot to spend the night in. One's place of sleep or rest. Sleep; rest; getting to sleep. The time for going to sleep or resting in bed; bedtime. Time spent in a bed. Marriage. Sexual activity.
Examples:
"My cat often sleeps on my bed.<br />I keep a glass of water next to my bed when I sleep."
"When camping, he usually makes a bed for the night from hay and a blanket."
"Go to bed!  I had breakfast in bed this morning."
"He's been afraid of bed since he saw the scary film."
"I read until bed."
"Too much bed, not enough rest."
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Bed as a noun (printing, dated):
A place, or flat surface or layer, on which something else rests or is laid. The bottom of a body of water, such as an ocean, sea, lake, or river. An area where a large number of oysters, mussels, other sessile shellfish, or a large amount of seaweed is found. A garden plot. A foundation or supporting surface formed of a fluid. The superficial earthwork, or ballast, of a railroad. The platform of a truck, trailer, railcar, or other vehicle that supports the load to be hauled. A shaped piece of timber to hold a cask clear of a ship's floor; a pallet. The flat part of the press, on which the form is laid. The flat surface of a scanner on which a document is placed to be scanned. A piece of music, normally instrumental, over which a radio DJ talks. Any of the sections of a dartboard with a point value, delimited by a wire.
Examples:
"The meats and cheeses lay on a bed of lettuce."
"sea bed;  river bed;  lake bed;  There's a lot of trash on the bed of the river."
"Oysters are farmed from their beds."
"We added a new bush to our rose bed."
"A bed of concrete makes a strong subsurface for an asphalt parking lot."
"The parcels were loaded onto the truck bed before transportation."
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Bed as a noun:
A layer or surface. A deposit of ore, coal, etc. the smallest division of a geologic formation or stratigraphic rock series marked by well-defined divisional planes (bedding planes) separating it from layers above and below. The horizontal surface of a building stone. The lower surface of a brick, slate, or tile. A course of stone or brick in a wall.
Examples:
"the upper and lower beds'"
"rfquotek Knight"
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Bed as a verb (transitive):
Senses relating to a bed as a place for resting or sleeping. To go to a bed. To place in a bed. To put oneself to sleep. To furnish with a bed or bedding. To have sexual intercourse with.
Examples:
"rfquotek Francis Bacon"
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Bed as a verb (transitive):
Senses relating to a bed as a place or layer on which something else rests or is laid. To lay or put in any hollow place, or place of rest and security, surrounded or enclosed; to embed. To set in a soft matrix, as paving stones in sand, or tiles in cement. To set out (plants) in a garden bed. To dress or prepare the surface of (stone) so it can serve as a bed. To lay flat; to lay in order; to place in a horizontal or recumbent position. To settle, as machinery.
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Tray as a noun:
A small, typically rectangular or round, flat, and rigid object upon which things are carried.
Examples:
"I carefully arranged the dishes on the tray and brought it upstairs."
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Tray as a noun:
A flat carrier for items being transported.
Examples:
"Make sure that tray of eggs is properly loaded."
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Tray as a noun:
The items on a full tray.
Examples:
"Before long they had consumed a whole tray of shrimp cocktails and sent for another."
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Tray as a noun:
A component of a device into which an item is placed for use in the device's operations.
Examples:
"The CD tray will not open."
"The loader is responsible for placing the work on the trays for the plating machines."
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Tray as a noun (computing, graphical user interface, informal):
A notification area used for icons and alerts.
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Tray as a noun (Australia):
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Tray as a verb (transitive):
To place (items) on a tray.
Examples:
"Be sure to tray eggs with the large end up."
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Tray as a verb (intransitive):
To slide down a snow-covered hill on a tray from a cafeteria.
Examples:
"Traying has provided collegiate fun and the occasional fatality for decades."
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Tray as a noun (obsolete):
Trouble; annoyance; anger.
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Tray as a verb (transitive, obsolete):
To grieve; annoy.
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Tray as a verb (transitive, obsolete):
To betray.
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Tray as a noun: