noun (n)

• a bridge partner who increases the partner's bid(noun.person)

  source: wordnet30
• someone concerned with the science or art or business of cultivating the soil(noun.person)

  Synonym:
  agriculturalist, agriculturist, cultivator, grower
  

  source: wordnet30
• One who, or that which, raises (in various senses of the verb).(noun)

  source: webster1913