ppm

noun

By · According to Wiktionary data (CC BY-SA) ·

"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)

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.

Source FrequencyWords open word-frequency list As of September 3, 2026

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

ppm vs PR
0% similar
ppm vs pt
33% similar
ppm vs PS
0% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for ppm
PropertyValue
Headwordppm
LanguageEnglish
Part of speechNoun
Letters3
Frequency rank#23,949
Misspellings tracked0
Confusable pairs20
SourceWiktionary (kaikki.org)

Where “ppm” sits in English frequency

Word frequency stretches from the small set of words we reach for constantly (left) out to the long tail barely used once in a while (right).ppmlands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

The axis is logarithmic, with each marked tick roughly ten times rarer than the last. Same rarity band neighbours include “powders” (#23,948), “preventable” (#23,950), “primed” (#23,951). Source: FrequencyWords open word-frequency list.

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

  1. 1
    Initialism of parts per million (10000 ppm = 1%).
  2. 2
    Initialism of page(s) per minute.

Recorded use

Wiktionary examples

These source excerpts show how ppm appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. The overflush consisted of 100 bbls of uncrosslinked 3000 ppm polymer, followed by one wellbore volume (~150 bbls) plus 450 bbls crude behind pipe.
  2. 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.

Frequently Asked Questions

How do you spell "ppm"?
"ppm" is spelled P-P-M.
What does "ppm" mean?
As a noun, "ppm" means: Initialism of parts per million (10000 ppm = 1%).
What words are commonly confused with "ppm"?
"ppm" is commonly confused with "PR", "pt", "PS". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
What language does "ppm" come from?
"ppm" is a English word. PlainSpell covers definitions, pronunciations, and spelling data across English, Spanish, Portuguese, French, and German.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

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).

ply#23,946PCT#23,938PCR#23,937PCB#23,936

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.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list