The suffix -tun appears on many nouns that name objects that are used as instruments.
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xul'um | write, mark |  |
xul'tun | pen, pencil, chalk, crayon |
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hwts'e'nutsum | sit |  |
shts'e'nutstun | chair |
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p'etth'ut | sew it |  |
p'utth'tun | needle |
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luxwut | cover it |  |
luxwtun | blanket |
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p'ukw | float up |  |
p'ukwten | float, buoy |
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q'uluts't | shelter it |  |
q'uluts'tun | umbrella, shelter |