ppm
"ppm" is a 3-letter English headword indexed on PlainSpell.
The verdict
“ppm” sits in 20 confusable pairs (corpus #23,949) as a noun. The look-alike neighbours are the real trap.
- #23,949
- frequency rank, English
- 4,417
- “P” headwords
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Initialism of parts per million (10000 ppm = 1%).
Corpus desk
Index EN-ppm · ppm · English
ppm · rank #23,949 · 0 variants · 20 confusables
- FREQ-MID #23,949
- LEN-MID 3 letters
- VOW-0 0 vowels
- CONFUS-HIGH 20 pairs
- VAR-0 0 variants
- BOOK-MID 4,417
- PHOTO-FINISH powders
Nearest frequency peer: powders (-1 rank slots)
Read with this headword: Spelling guide for this pattern
Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.
Frequency neighbourhood for “ppm”
Lower corpus rank = more everyday usage (inverted bar length for readability)
- ply
ply
76,055 corpus weight
- powders
powders
76,053 corpus weight
- ppm
ppm
76,052 corpus weight
- preventable
preventable
76,051 corpus weight
- primed
primed
76,050 corpus weight
- prog
prog
76,049 corpus weight
What this shows Bars show where “ppm” sits against the nearest ranked English headwords in the FrequencyWords band, not a reprint of letter-browse containment.
Visual similarity to commonly confused words
How many letter changes separate each confused pair (Levenshtein distance, normalized).
Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).
| Property | Value |
|---|---|
| Headword | ppm |
| Language | English |
| Part of speech | Noun |
| Letters | 3 |
| Frequency rank | #23,949 |
| Misspellings tracked | 0 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Where “ppm” sits in English frequency
Easy to mix with look-alikes
The spelling risk for ppm is neighbouring look-alikes ("PR", "pt", …), not just typos; it is anoun. Frequency #23,949 among 4,417 “P” headwords. 2 recorded senses keep meaning in play.
No generated misspelling entries exist for ppm in our index, since its letter pattern doesn't lend itself to common typo substitutions. It also participates in 20 confusable-pair relationships, "PR", "pt", "PS", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.
No explicit etymology string is stored for this entry, so its spelling is best explained by sound-to-letter mapping rather than etymology. The correct English form is ppm, spelled P-P-M.
Definition
- 1Initialism of parts per million (10000 ppm = 1%).
- 2Initialism of page(s) per minute.
Recorded use
Wiktionary examplesThese source excerpts show how ppm appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
The overflush consisted of 100 bbls of uncrosslinked 3000 ppm polymer, followed by one wellbore volume (~150 bbls) plus 450 bbls crude behind pipe.
PIRG noted the European Union has a limit of 300 ppm for boron and that there should be a “full-fledged investigation to determine if limits should be established” in the US.
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.
PlainSpell is rendered directly from structured Wiktionary extracts and open word-frequency lists, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of September 3, 2026. Primary sources: Wiktionary (via kaikki.org) and FrequencyWords.
Frequently Asked Questions
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Similar English words by spelling shape
Same letter count and similar misspelling depth for "ppm", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 3 letters (nearest by frequency rank).
What to do next
You've looked up "ppm". Here's where to go from here.
- "ppm" maps to 20 confusable pairs in this vintage; the highest-scored is "PR". View pair
- Usage frequency rank #23,949 among English headwords in this corpus. Corpus statistics
- Browse more English words in the "P" letter cohort. P–Z browse
- PlainSpell rotates a curated Word of the Day from the English corpus, a passive way to discover vocabulary. Word of the Day
PlainSpell is a reference corpus, not spelling advice. Verify unusual forms in context.
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.