an expert who observes and comments on something  
<noun.person> freq. cnt.: 11 freq. cnt.: 9 freq. cnt.: 2
<noun.person> freq. cnt.: 11 freq. cnt.: 9 freq. cnt.: 2
| commentator |   | 
| observer |   | 
lexical pointers
derivationally related form
lexical pointers
derivationally related form
