n.
 something which is not correct; an inaccuracy. 
▸an act or judgement that is misguided or wrong.
v.
 (past mistook; past part. mistaken)
 be wrong about. 
▸
(mistake someone/thing for)
 wrongly identify someone or something as.
Derivative
  
    - mistakable 
(also mistakeable)
 adj.
- mistakably 
(also mistakeably)
 adv.
 
  Etymology
  ME (as v.): from ON mistaka ‘take in error’, prob. influenced in sense by OFr. mesprendre.