| Prefix for space or naut | 24 |
| Prefix for space or gram | 24 |
| Prefix for space or dynamics | 28 |
| Prefix for social or trust | 26 |
| Prefix for social or freeze | 27 |
| Prefix for skeleton or spore | 28 |
| Prefix for sex or verse | 23 |
| Prefix for septic or social | 27 |
| Prefix for season or deceased | 29 |
| Prefix for scope or vision | 26 |
| Prefix for scope or patetic | 27 |
| Prefix for scope or meter | 25 |
| Prefix for scope or graph | 25 |
| Prefix for science or bus | 25 |
| Prefix for schaum or kat | 24 |
| Prefix for said or thought | 26 |
| Prefix for room or date | 23 |
| Prefix for rhyme or rail | 24 |
| Prefix for rail or plane | 24 |
| Prefix for profit or sked | 25 |
| Prefix for profit or dairy | 26 |
| Prefix for pret or cession | 26 |
| Prefix for present or bus | 25 |
| Prefix for potent or present | 28 |
| Prefix for potent or bus | 24 |
| Prefix for port or pad | 22 |
| Prefix for poise or nox | 23 |
| Prefix for poise and valence | 28 |
| Prefix for pod or plane | 23 |
| Prefix for pod or corn | 22 |
| Prefix for pod or angle | 23 |
| Prefix for ply or tude | 22 |
| Prefix for plunk or plop | 24 |
| Prefix for plop or plunk | 24 |
| Prefix for plop or choo | 23 |
| Prefix for play or band | 23 |
| Prefix for plane or space | 25 |
| Prefix for plane or sol | 23 |
| Prefix for plane or marine | 26 |
| Prefix for plane or dynamics | 28 |
| Prefix for plane or dynamic | 27 |
| Prefix for pipe cleaners | 24 |
| Prefix for physics or turf | 26 |
| Prefix for physics or thesis | 28 |
| Prefix for physics or phor | 26 |
| Prefix for phrase or physical | 29 |
| Prefix for photo or scope | 25 |
| Prefix for phone or watt | 24 |
| Prefix for phone or ton | 23 |
| Prefix for phone or post | 24 |
| Prefix for phone or cycle | 25 |
| Prefix for phone or bucks | 25 |
| Prefix for phobia or bat | 24 |
| Prefix for penultimate | 22 |
| Prefix for pede or grade | 24 |
| Prefix for pad or port | 22 |
| Prefix for Norman or Saxon | 26 |
| Prefix for nomy or logy | 23 |
| Prefix for night or day | 23 |
| Prefix for net or state | 23 |
| Prefix for naut or gram | 23 |
| Prefix for name or real | 23 |
| Prefix for mural or venous | 26 |
| Prefix for mural or state | 25 |
| Prefix for motor or control | 27 |
| Prefix for morph or skeletal | 28 |
| Prefix for morph or plasm | 25 |
| Prefix for mode or king | 23 |
| Prefix for mobile or pilot | 26 |
| Prefix for metric or tonic | 26 |
| Prefix for metric and tope | 26 |
| Prefix for meter or winkle | 26 |
| Prefix for meter or tude | 24 |
| Prefix for meter or tribe | 25 |
| Prefix for meter or spore | 25 |
| Prefix for meter or scope | 25 |
| Prefix for meter or pede | 24 |
| Prefix for meter or liter | 25 |
| Prefix for meter or gram | 24 |
| Prefix for medic or graph | 25 |
| Prefix for mature or dominant | 29 |
| Prefix for mate or mobile | 25 |
| Prefix for logy or nomy | 23 |
| Prefix for logy and nomics | 26 |
| Prefix for logical or motor | 27 |
| Prefix for logical or gram | 26 |
| Prefix for logic or centric | 27 |
| Prefix for log or gram | 22 |
| Prefix for lock or view | 23 |
| Prefix for lithic or plastic | 28 |
| Prefix for light or night | 25 |
| Prefix for life or wife | 23 |
| Prefix for legal or sailing | 27 |
| Prefix for legal or normal | 26 |
| Prefix for legal or medic | 25 |
| Prefix for legal or chute | 25 |
| Prefix for lay or play | 22 |
| Prefix for lateral or librium | 29 |
| Prefix for lateral or distant | 29 |
| Prefix for john or god | 22 |