The suffix form of "fool" is "-ish," as in "foolish."
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Speak itself has no suffix, but it can have the suffix un- in
its form unspoken.
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The combining form is "disk/o-" and the suffix is "-ectomy."
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Yes, "multicellular" has a suffix. The suffix "-ar" is added to the root word "cell" to form "cellular," and then "multi-" is added as a prefix to form "multicellular."