I. pil‧low¹ /ˈpɪləʊ $ -loʊ/ noun [countable]
[Language: Old English; Origin: pyle, from Latin pulvinus]

1. a cloth bag filled with soft material that you put your head on when you are sleeping:
I’ll be asleep as soon as my head hits the pillow. ⇒ cushion¹(1)

2. pillow fight a game in which children hit each other with pillows

3. pillow talk informal conversation between lovers in bed

[TahlilGaran] Dictionary of Contemporary English ▲

II. pillow² verb [transitive always + adverb/preposition] literary
to rest your head somewhere:
His head was pillowed on his arm.

[TahlilGaran] Dictionary of Contemporary English ▲

pillow
noun
ADJ. feather | lumpy
VERB + PILLOW fluff (up), plump up, pummel, punch She plumped up the pillows for her sick daughter.
fall/lie/sink back against/on He lay back on his pillows and closed his eyes.
be propped (up) on | bury your face/head in She buried her head in the pillow and wept.
PILLOW + NOUN case, slip | fight

[TahlilGaran] Collocations Dictionary ▲

pillow
noun
BAD: The pillows had been removed from the sofa and scattered on the floor.
GOOD: The cushions had been removed from the sofa and scattered on the floor.

Usage Note:
pillow = a bag-like object filled with soft material that you rest your head on when you are in bed: 'No sooner had his head touched the pillow than he was sound asleep.'
cushion = a bag-like object filled with soft material that you put on a chair, sofa etc to make it more comfortable: 'Would you like a cushion for your back?'

[TahlilGaran] Dictionary of Common Errors ▲