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

2 senses of doubter

Sense 1
skeptic, sceptic, doubter -- (someone who habitually doubts accepted beliefs)
       => intellectual, intellect -- (a person who uses the mind creatively)

Sense 2
agnostic, doubter -- (someone who is doubtful or noncommittal about something)
       => person, individual, someone, somebody, mortal, soul -- (a human being; "there was too much for one person to do")