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Since there are six distinct Celtic languages there would be six different words.
There is no such language as Celtic. Celtic refers to a group of more than a dozen different languages, six of which are still spoken today: Irish Gaelic Scottish Gaelic Welsh… Breton Cornish Manx
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 "ridire" In Welsh "marchog"
Irish: toirneach Scots Gaelic: tàirneach; tàirneach; torrann Welsh: taran(au), tyrfau, trystau
Irish: aingeal Scots Gaelic: aingeal Welsh: angel
In Welsh: a enillwyd In Irish: tuillte In Scottish Gaelic: coisinnte
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 mathúin / béar In Welsh it's "arth" In Scots Gaelic it's "mathan"
cairde (Irish) càirdean (Scottish Gaelic) cyfeillion, ffrindiau (Welsh) karidi, keveiled (Breton)
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
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