| DOWNSPOUTS | • downspouts n. Plural of downspout. • DOWNSPOUT n. (US) a drainpipe. |
| DUOPSONIES | • duopsonies n. Plural of duopsony. • DUOPSONY n. the market condition when there are two buyers only. |
| IONOPAUSES | • ionopauses n. Plural of ionopause. • IONOPAUSE n. the region of the earth's atmosphere at the outer limit of the ionosphere. |
| MONOPULSES | • MONOPULSE n. a type of radar system used in gun control. |
| OUTPASSION | • outpassion v. (Transitive, rare) To be more passionate than; to surpass in passion. • OUTPASSION v. to exceed in passion. |
| POLLUSIONS | • pollusions n. Plural of pollusion. • POLLUSION n. (Shakespeare) blunder for allusion. |
| POROUSNESS | • porousness n. The quality of being porous; porosity. • POROUSNESS n. the quality of being porous. |
| PROCONSULS | • proconsuls n. Plural of proconsul. • PROCONSUL n. an officer who discharged the duties of a consul without being himself consul; a governor of, or a military commander in, a province. |
| PROFUSIONS | • profusions n. Plural of profusion. • PROFUSION n. the state of being profuse. |
| PROLUSIONS | • prolusions n. Plural of prolusion. • PROLUSION n. preliminary performance, activity or display. |
| SOUNDPOSTS | • soundposts n. Plural of soundpost. • sound␣posts n. Plural of sound post. • SOUNDPOST n. a small post on guitars, violins etc. that joins the front surface to the back. |
| SOUPSPOONS | • soupspoons n. Plural of soupspoon. • soup␣spoons n. Plural of soup spoon. • SOUPSPOON n. a spoon for eating soup. |
| SOUSAPHONE | • sousaphone n. A valved brass instrument with the same length as a tuba, but shaped differently so that the bell is… • SOUSAPHONE n. a musical instrument similar to a tuba. |
| SPONDYLOUS | • spondylous adj. Relating to spondyles; vertebral. • SPONDYLOUS adj. like a spondyl, a vertebra. |
| SUPERMOONS | • supermoons n. Plural of supermoon. • Supermoons n. Plural of Supermoon. • super␣moons n. Plural of super moon. |