Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun tester

2 senses of tester

Sense 1
examiner, tester, quizzer -- (someone who administers a test to determine your qualifications)
       => inquirer, enquirer, questioner, querier, asker -- (someone who asks a question)

Sense 2
tester -- (a flat canopy (especially one over a four-poster bed))
       => canopy -- (a covering (usually of cloth) that serves as a roof to shelter an area from the weather)