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We weren't able to find "fruster"
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fruster - (not a recognized word)
frustrate - cause (someone) to feel upset or annoyed
foster - encourage or promote the development of (something, typically something regarded as good)
fluster - make (someone) agitated or confused
muster - assemble (troops), especially for inspection or in preparation for battle
cluster - a group of similar things or people positioned or occurring closely together
fester - (of a wound or sore) become septic; suppurate