tester vs quizzer

tester and quizzer both are nouns.

Word	Noun	Adjective	Verb	Adverb
tester	Yes	No	No	No
quizzer	Yes	No	No	No

As nouns, tester and quizzer are synonyms defined as:

tester and quizzer: someone who administers a test to determine your qualifications

Other synonyms of tester include examiner.

tester (noun)	quizzer (noun)
a flat canopy (especially one over a four-poster bed)	someone who administers a test to determine your qualifications
someone who administers a test to determine your qualifications