| filth | (noun) an offensive or indecent word or phrase | Synonyms: dirty word, obscenity, smut, vulgarism |
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| (noun) a state characterized by foul or disgusting dirt and refuse | Synonyms: filthiness, foulness, nastiness |
| (noun) anything regarded as making something unclean | Synonyms: dirt, grease, grime, grunge, soil, stain |
| (noun) any substance considered disgustingly foul or unpleasant | Synonyms: crud, skank |
| tilth | (noun) arable land that is worked by plowing and sowing and raising crops | Synonyms: cultivated land, farmland, ploughland, plowland, tillage, tilled land |
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| (noun) the state of aggregation of soil and its condition for supporting plant growth | - |