fer feral ferment fermentation fermentations fermented fermenting ferments fermium fermiums fern fernier ferniest ferns ferny ferocious ferociously ferociousness ferociousnesses ferocities ferocity ferret ferreted ferreting ferrets ferric ferried ferries ferromagnetic ferrous ferrule ferrules ferry ferryboat ferryboats ferrying ferryman ferrymen fertile fertilities fertility fertilization fertilizations fertilize fertilized fertilizer fertilizers fertilizes fertilizing ferule ferules fervencies fervency fervent fervently fervid fervidly fervor fervors fervour fervours