Princeton's WordNet

1. kelvin, K(noun)

   the basic unit of thermodynamic temperature adopted under the Systeme International d'Unites

   Synonyms:
   chiliad, one thousand, kilobyte, honey oil, jet, kibibyte, super acid, atomic number 19, green, kelvin, super C, special K, kB, thou, grand, thousand, yard, cat valium, potassium

   Antonyms:
   ordinal

2. potassium, K, atomic number 19(noun)

   a light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite

   Synonyms:
   chiliad, one thousand, kilobyte, honey oil, jet, kibibyte, super acid, atomic number 19, green, kelvin, super C, special K, kB, thou, grand, thousand, yard, cat valium, potassium

   Antonyms:
   ordinal

3. thousand, one thousand, 1000, M, K, chiliad, G, grand, thou, yard(noun)

   the cardinal number that is the product of 10 and 100

   Synonyms:
   railyard, megabyte, special K, green, guanine, gigabyte, super C, kibibyte, potassium, thousand, mebibyte, g-force, metre, cat valium, universal gravitational constant, atomic number 19, gibibyte, railway yard, kB, curtilage, grounds, yard, grand, super acid, kelvin, gramme, pace, kilobyte, gee, chiliad, cubic yard, molar concentration, deoxyguanosine monophosphate, molarity, meter, honey oil, constant of gravitation, gravitational constant, one thousand, gram, grand piano, thou, gm, jet

   Antonyms:
   ordinal

4. kilobyte, K, KB, kB(noun)

   a unit of information equal to 1000 bytes

   Synonyms:
   one thousand, kilobit, yard, honey oil, jet, kelvin, kibibyte, super acid, atomic number 19, green, kilobyte, super C, special K, kB, thou, kbit, grand, thousand, potassium, cat valium, chiliad

   Antonyms:
   ordinal

5. kilobyte, kibibyte, K, KB, kB, KiB(noun)

   a unit of information equal to 1024 bytes

   Synonyms:
   one thousand, kilobit, yard, honey oil, jet, kelvin, kibibyte, super acid, atomic number 19, green, kilobyte, super C, special K, kB, thou, kbit, grand, thousand, potassium, cat valium, chiliad

   Antonyms:
   ordinal

6. K, k(noun)

   the 11th letter of the Roman alphabet

   Synonyms:
   chiliad, one thousand, kilobyte, honey oil, jet, kibibyte, super acid, atomic number 19, green, kelvin, super C, special K, kB, thou, grand, thousand, yard, cat valium, potassium

   Antonyms:
   ordinal

7. K, jet, super acid, special K, honey oil, green, cat valium, super C(adj)

   street names for ketamine

   Synonyms:
   chiliad, special K, commons, super C, kibibyte, potassium, thousand, kilobyte, cat valium, blue jet, common, kelvin, park, kB, yard, grand, spurt, atomic number 19, super acid, greenness, thou, jet-propelled plane, putting surface, spirt, green, reverse lightning, jet plane, fountain, honey oil, squirt, leafy vegetable, greens, one thousand, putting green, viridity, jet

   Antonyms:
   ordinal

8. thousand, one thousand, 1000, m, k(adj)

   denoting a quantity consisting of 1,000 items or units

   Synonyms:
   m, one thousand, thousand, k

   Antonyms:
   ordinal