SILTSTONE Antonyms There are 10 antonyms of the word siltstone. (opposite meanings)Did you mean?Definition of SILTSTONEAlso try opposite words for..siltysiltationBest Opposite Words For SILTSTONETop 20Top 10 Top 20 (Default)Top 50 Top 100 All All (Default)WordsPhrases All All (Default)Verb Noun Adjective Adverb RankWordSave?Synonyms..UsageType1basaltnounn2conglomeratenounn3gneissnounn4granitenounn5limestonenounn6marbleverb, nounv, n7quartzitenounn8sandstonenounn9shalenounn10slateverb, nounv, n Alternatives for CONGLOMERATE Words (14)aggregateamalgamateblendcoalescecombinefuseintegratemergeuniteaccumulateamasscumulateempiregatherPhrases (2)pile uppudding stoneOpposite words for conglomerate Alternatives for GRANITE Words (6)bouldercliffcobblestonepebblerockstoneOpposite words for granite Alternatives for LIMESTONE Words (1)limePhrases (1)calcium carbonateOpposite words for limestone Alternatives for MARBLE Words (7)bouldergranitemarblepebblerockstonemarbleizeOpposite words for marble