List of 3-letter words containing

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There are 16 three-letter words containing OS

BOS	• bos n. Plural of bo. • bos sym. (International standards) ISO 639-2 & ISO 639-3 language code for Bosnian. • Bos prop.n. A taxonomic genus within the family Bovidae – the cattle.
COS	• cos n. A variety of lettuce with long, crisp leaves. • cos conj. (Informal, UK, Ireland, South Africa, AAVE) because. • cos n. (Informal, AAVE) A cousin, cuz.
DOS	• dos n. Plural of do. • dos n. (Music) plural of do. • DoS n. (Computing, Internet) A denial-of-service attack.
GOS	• GoS n. (Telecommunications) Initialism of grade of service. • GOS n. Initialism of galactooligosaccharides. • GO n. a Japanese board game.
HOS	• hos n. Plural of ho. • HOS n. Initialism of hall of shame. • HOS n. Initialism of head of state.
IOS	• ios n. Plural of io. • Ios prop.n. An island in the Cyclades, Greece. • iOS prop.n. (Computing, mobile telephony) A mobile operating system (OS) created and developed by Apple Inc. exclusively…
KOS	• kos sym. (International standards) ISO 639-2 & ISO 639-3 language code for Kosraean. • Kos prop.n. An island in the Dodecanese, Greece. • KOs n. Plural of KO.
LOS	• LOs n. Plural of LO. • LOS n. (Transport) Initialism of level of service. • LOS n. Initialism of line of sight.
MOS	• mos n. (Rare) singular of mores (“moral norms or customs”). • mos n. Plural of mo (“month; molester”). • mos sym. (International standards) ISO 639-2 & ISO 639-3 language code for Mooré.
NOS	• nos n. Plural of no. • nos n. Alternative form of nos. Abbreviation of numbers. • nos n. (Countable) Acronym of nitrous oxide system.
OOS	• oos n. Plural of oo. • OOS n. (Physics, measurement) Initialism of object-oriented scanning. • OOS adj. (Engineering) Initialism of out of specification.
OSE	• OSE prop.n. Initialism of Operating System Embedded. • -ose suff. Full of. • -ose suff. (Chemistry) Used to form the names of sugars.
POS	• pos adj. (UK, slang) Clipping of positive. • pos adj. (Slang) Clipping of HIV positive. • pos n. Plural of po.
SOS	• sos n. Plural of so. • SOs n. Plural of SO. • SOS n. The conventional Morse code call made by a ship in distress.
WOS	• wos v. Eye dialect spelling of was. • WoS prop.n. Initialism of w:Web of Science. • WOs n. Plural of WO.
ZOS	• zos n. Plural of zo. • Zos prop.n. The individual human body and mind, in the dualist occultism of Austin Osman Spare. • ZO n. (Tibetan) a cross between a yak and a cow, also DSO, DZHO, DZO, ZHO.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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See this list for:

English Wiktionary: 111 words
Scrabble in French: 11 words
Scrabble in Spanish: 12 words
Scrabble in Italian: 7 words
Scrabble in German: 9 words
Scrabble in Romanian: 11 words

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