fluster

[1]

agitate , stir (up) , discompose , discomfit , discomfort , disconcert , shake (up) , upset , disquiet , discommode , bother , put out/off , disturb , perturb , flurry , flutter , make nervous , throw off , distract , confuse , baffle , confound , puzzle , perplex , befuddle , bewilder , daze , dazzle , (Colloq) rattle , throw , discombobulate , hassle , faze

[1]	perturbation
[2]	agitation , upset , discomfort , disquiet , bother , disturbance , commotion , perturbation , dither , flurry , flutter , nervousness , distraction , confusion , bafflement , befuddlement , perplexity , bewilderment