A paper collector
A badge collector.
A bibiliophile.
The proper identification is an entomologist, which is a person that studies insects. However, if you want to be very technical, a person that collects actual bugs, which are a type (or class) of insect, that person is called a hemipterologist.
A deltiologist is a person who collects poststamps as a hobby.
The terms are lessor (the person who collects the rent) and lessee (the person who is paying the rent).
A person who collects beetles is a coleopterist.
Bibliophile
A cravatologist.
collecter
a strawber.
supernatural
A car collector?
a button collector
A badge collector.
A gem collector
If you need the answer to the joke it is "a watchman"
amazing