1. (n.) One who, or that which, fills; something used for filling.

2. (n.) A thill horse.

IC analysis appositive attribute attributive bidet bush bushing carriage horse cart horse cavalry horse complement construction modifier cutting deep structure direct object doubling doublure draft horse dray horse driving horse facing fill horse filling form-function unit function gigster hack hackney hunter immediate constituent analysis indirect object inlay inlayer insole interlineation jument lead leader levels liner lining modifier mount object pack horse packing padding palfrey phrase structure plow horse pole horse polo pony post-horse predicate qualifier ranks remount rider riding horse road horse roadster rouncy saddle horse saddler shaft horse shallow structure slot slot and filler stalking-horse strata structure stuffing subject sumpter sumpter horse surface structure syntactic analysis syntactic structure syntactics syntax tagmeme thill horse thiller underlying structure wadding wainscot wheeler wheelhorse word arrangement word order workhorse