\usepackage[first=1,last=50,counter=randomcounterfornoisyword]{lcg} \usepackage{ifthen} % \noisyword{canal,canard,2} has a 1/2 chance of write "canard" instead of "canal " % \noisyword{canal,canard} has a 1/50 chance of write "canard" instead of "canal " \newcommand{\noisyword}[3]{ \ifthenelse{ \equal{#3}{} } {\chgrand[last=50]} {\chgrand[last=#3]} \phantom{\rand\arabic{randomcounterfornoisyword}} \ifthenelse{ \equal{\arabic{randomcounterfornoisyword}}{1} } {#2} {#1} } \newcommand{\canal}[0]{ \noisyword{canal}{canard}{20} } \newcommand{\agregator}[0]{ \noisyword{agregator}{aligator}{20} }