BOULDER FERN Antonyms There are 2 antonyms of the phrase boulder fern. (opposite meanings)Did you mean?Definition of BOULDER FERNAlso try opposite words for..fernfernyboulderboulderyboulderingBest Opposite Words For BOULDER FERNTop 20Top 10 Top 20 (Default)Top 50 Top 100 All All (Default)WordsPhrases All All (Default)Verb Noun Adjective Adverb RankWordSave?Synonyms..UsageType1boulderverb, nounv, n2fernnounn Alternatives for BOULDER Words (8)blockchunkmasspebblerockslabstonebowlderOpposite words for boulder