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Since there are six distinct Celtic languages there would be six different words.
Perhaps this information on "Answers.com" may assist you in learning and forming your own deduction: http://www.answers.com/topic/pronunciation-of-celtic
Irish: abhainn Scottish: abhainn Welsh: afon Breton:
In Irish it's: madra / gadhar In Welsh it's "ci" In Scots Gaelic it's "cù"
In Irish it's "aonbheannach" In Welsh it's "uncorn" In Scots Gaelic it's "aon-adharcach"
In Irish "ridire" In Welsh "marchog"
Irish: toirneach Scots Gaelic: tàirneach; tàirneach; torrann Welsh: taran(au), tyrfau, trystau
In Irish it's "sliabh" In Scots Gaelic it's "beinn" In Manx: In Welsh it's "mynydd" In Breton: In Cornish:
In Irish it's "síocháin". In Scottish Gaelic it is sìth In Welsh it is heddwch (also tangnefedd)
cairde (Irish) càirdean (Scottish Gaelic) cyfeillion, ffrindiau (Welsh) karidi, keveiled (Breton)
Irish: ansiúd/thall (adverb); thar; lastall de; taobh thall de (preposition) Scots Gaelic: thall; thairis; seach; thar Welsh: tu hwnt
There's actually no such language as "Celtic". Celtic refers to a group of dozens of languages, six of which are spoken today: BretonCornishIrish GaelicManxScottish GaelicWel…sh
Irish: ceannairc; éirí amach; reibiliún Scots Gaelic: ceannairc; aramach; reubalachd Welsh: gwrthryfel
Scottish Gaelic: taigh-fuine or taigh-fuinn Irish Gaelic: bácús Welsh: popty
Irish Gaelic: cloch Scottish Gaelic: clach Welsh: carreg or maen
Irish: noun: drithle, spréacharnach; verb: drithligh, glinnigh Scottish Gaelic: noun: splang, lainnir, sradrach verb: srad, loinnrich Welsh: verb: gwreichioni, serennu, pef…rio