Paul Pry
Peeping Tom
asker
busybody
catechist
cross-interrogator
cross-questioner
detective
eavesdropper
examiner
gossip
inquirer
inquisitionist
inquisitive
interlocutor
interpellator
interrogator
interrogatrix
interviewer
nosy Parker
opinion-sampler
poller
pollster
prober
pry
querier
querist
questioner
questionist
quidnunc
quizzer
rubberneck
rubbernecker
sampler
scopophiliac
secret agent
sightseer
snoop
snooper
voyeur
yenta
enquirer
class-leader
inquisition
prelate
Visitor
visitor