The best replacement for adverb is adjective.

The best alternatives to adverb are rated as following:
★★★★★  adjective
★★★★  preposition
★★★  adjective quiz
★★★  adjective worksheet
★★★  adjective clause
★★  verb
★  adjective phrases
★  adjective practice
★  adjective phrase
★  adverbial
★  adjective worksheets
★  adjective prepositional phrase
★  verb first
  adjective exercises
  auxiliary verb
  noun
  adjective exercise
  participle
  conjunction
  adjective clauses
  adjective ppt
  prepositional phrase
  adjective phrase quiz
  helping verb
  adjective prepositional phrases
  proverb
  adjectives
  adjektiv
  prepositional phrase quiz
  adjective definition

Your alternative for adverb is not listed? Suggest!
Speaking about adverb, one probably shouldn't forget about infinitive.

Other search terms related to adverb and their ratings are:
★★★★★ infinitive
★ semicolon
★ equal
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adverb
adjective
preposition