One is from Latin scāla, the other from Latin schola - they fell together in pronunciation in Welsh but have separate origins. Compare Englisch “to scale (a ladder)” / “(measuring) scale” and “school”.
I think they are differentiated here in Pen Llyn at least, as ‘ystol’ for ladder and ‘ysgol’ for school.Dunno how far this goes.
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Same here in Sir Fôn.
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