| Unit of punishment | 18 |
| Unit of progress | 16 |
| Unit of professional conduct | 28 |
| Unit of prevention | 18 |
| Unit of pressure: Abbr. | 23 |
| Unit of pressure (Abbr.) | 24 |
| Unit of pressure | 16 |
| Unit of power, for short | 24 |
| Unit of power ratio | 19 |
| Unit of power | 13 |
| Unit of potential difference | 28 |
| Unit of play in squash | 22 |
| Unit of petrol | 14 |
| Unit of perspiration | 20 |
| Unit of pearls | 14 |
| Unit of parsley or thyme | 24 |
| Unit of parsley | 15 |
| Unit of pain | 12 |
| Unit of orthodoxy | 17 |
| Unit of optical power of a lens | 31 |
| Unit of online popularity | 25 |
| Unit of one cycle a second | 26 |
| Unit of oil production: Abbr. | 29 |
| Unit of oil production, briefly | 31 |
| Unit of ocular relief | 21 |
| Unit of noise | 13 |
| Unit of nautical time | 21 |
| Unit of nautical displacement | 29 |
| Unit of metrical time | 21 |
| Unit of metric volume | 21 |
| Unit of memory | 14 |
| Unit of medicine | 16 |
| Unit of measurement consisting of 72 days, in modern-day slang | 62 |
| Unit of measurement | 19 |
| Unit of measure: Abbr. | 22 |
| Unit of measure in a garage? | 28 |
| Unit of measure equal to 63 gallons | 35 |
| Unit of measure | 15 |
| Unit of meas. that's often leveled | 38 |
| Unit of matter: Abbr. | 21 |
| Unit of matter | 14 |
| Unit of mass, briefly | 21 |
| Unit of mass transit | 20 |
| Unit of magnetism | 17 |
| Unit of magnetic intensity | 26 |
| Unit of magnetic inductivity | 28 |
| Unit of magnetic induction | 26 |
| Unit of magnetic flux named for a German physicist | 50 |
| Unit of magnetic flux density | 29 |
| Unit of magnetic flux | 21 |
| Unit of magnetic field strength | 31 |
| Unit of luminous intensity | 26 |
| Unit of luminous flux | 21 |
| Unit of luminance | 17 |
| Unit of loudness | 16 |
| Unit of longitude | 17 |
| Unit of local govt. | 19 |
| Unit of literature? | 19 |
| Unit of literature | 18 |
| Unit of linear or square measure | 32 |
| Unit of light-bulb intensity | 28 |
| Unit of light or hope | 21 |
| Unit of light intensity | 23 |
| Unit of light energy | 20 |
| Unit of light bulb intensity | 28 |
| Unit of light | 13 |
| Unit of life | 12 |
| Unit of length used for measuring nuclear distances | 51 |
| Unit of length that's roughly the diameter of a proton | 58 |
| Unit of length for Noah | 23 |
| Unit of length equal to 1,760 yards | 35 |
| Unit of length | 14 |
| Unit of laundry | 15 |
| Unit of laughter | 16 |
| Unit of land measurement | 24 |
| Unit of land measure | 20 |
| Unit of land area | 17 |
| Unit of land | 12 |
| Unit of labor | 13 |
| Unit of Kiribati | 16 |
| Unit of irrigation | 18 |
| Unit of instruction | 19 |
| Unit of inheritance | 19 |
| Unit of information | 19 |
| Unit of inductance | 18 |
| Unit of indigestion relief | 26 |
| Unit of illumination | 20 |
| Unit of house work | 18 |
| Unit of hope? | 13 |
| Unit of hope | 12 |
| Unit of heredity | 16 |
| Unit of heat? | 13 |
| Unit of heat: Abbr. | 19 |
| Unit of heat, for short | 23 |
| Unit of heat energy | 19 |
| Unit of heat | 12 |
| Unit of hair | 12 |
| Unit of gunpowder | 17 |
| Unit of grass | 13 |
| Unit of gossip | 14 |