| DISULFOTONS | • DISULFOTON n. an organophosphorus systemic insecticide. |
| DOBSONFLIES | • dobsonflies n. Plural of dobsonfly. • DOBSONFLY n. the larva of a large neuropterous insect, used as fish bait, also DOBSON. |
| FESTOLOGIES | • festologies n. Plural of festology. • FESTOLOGY n. a treatise on ecclesiastical festivals, also FESTILOGY. |
| FETOLOGISTS | • fetologists n. Plural of fetologist. • FETOLOGIST n. one who studies the fetus. |
| FOLKLORISTS | • folklorists n. Plural of folklorist. • FOLKLORIST n. a student of folklore. |
| FOLLOWSHIPS | • FOLLOWSHIP n. the practice of doing what other people suggest. |
| FOOLISHNESS | • foolishness n. (Uncountable) The state of being foolish. • foolishness n. (Countable) A thing or event that is foolish, or an absurdity. • FOOLISHNESS n. the state of being foolish. |
| FRITHSTOOLS | • frithstools n. Plural of frithstool. • frith␣stools n. Plural of frith stool. • FRITHSTOOL n. a seat in churches near the altar, to which offenders formerly fled for sanctuary. |
| FRONTOLYSIS | • frontolysis n. (Meteorology) The degeneration or dissipation of an atmospheric weather front. • FRONTOLYSIS n. the weakening or disappearance of a weather front. |
| ICHNOFOSSIL | • ichnofossil n. (Paleontology) A trace fossil; a fossil record that preserves some activity of an organism, but no part… • ICHNOFOSSIL n. a fossil footprint. |
| ISOFLAVONES | • isoflavones n. Plural of isoflavone. • ISOFLAVONE n. a plant oestrogen, found esp. in soy beans, having possible nutritional benefits. |
| LOOSESTRIFE | • loosestrife n. Any of certain flowering plants of the genera Lythrum and Lysimachia, which are not closely related. • LOOSESTRIFE n. a wild flower of the primrose family. |
| MACROFOSSIL | • macrofossil n. (Paleontology) Any fossil large enough to be examined without a microscope. • MACROFOSSIL n. a fossil large enough to be seen with the naked eye. |
| MICROFOSSIL | • microfossil n. A microscopic fossil. • MICROFOSSIL n. a very small fossil. |
| SINGLEFOOTS | • singlefoots v. Third-person singular simple present indicative form of singlefoot. |