The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Ordinal adjectives (1 member)
- Organs (5 members)
- Other spellings (221 members)
- Oxford (42 members)
- PDFs (1 member)
- Pages with broken file links (12 members)
- Pages with maps (1 member)
- Pages with non-numeric formatnum arguments (1 member)
- Pages with script errors (57 members)
- Papers (1 member)
- Parallel Text (62 members)
- Parallel Texts (3 members)
- Pars Today (Iran Hausa Radio) (13 members)
- Part of speech templates (29 members)
- Particles (2 members)
- Parts of speech (3 members)
- Past participles (543 members)
- Past tense forms (527 members)
- People (44 members)
- Personal pronouns (7 members)
- Photography (1 member)
- Phrasal verbs (3 members)
- Phrase (1 member)
- Phrases (8 members)
- Physics (2 members)
- Planets (1 member)
- Plants (14 members)
- PluralBot1 (1,030 members)
- PluralBot1/2018-07-14 UNIQUE NOUNS WITH NO PLURALS (0 members)
- PluralBot2 (195 members)
- PluralBot3 (3 members)
- PluralBot3/English Plurals with Numbered Example Sentences (0 members)
- Plurals (3,147 members)
- Podcasts (5 members)
- Poems (1 member)
- Politics (11 members)
- Prayers (1 member)
- Predeterminer modifiers (2 members)
- Prefixes (4 members)
- Prepositions (127 members)
- Present participles (365 members)
- ProZ (1 member)
- Professions (1 member)
- Projects (6 members)
- Pronouns (77 members)
- Pronunciation templates (4 members)
- Proper nouns (109 members)
- Proverbs (6 members)
- Psychology (4 members)
- Punctuation marks (3 members)