PSA

noun

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

"psa" is a 3-letter English headword indexed on PlainSpell.

The verdict

“PSA” sits in 20 confusable pairs (corpus #15,483) as a noun. The look-alike neighbours are the real trap.

#15,483
frequency rank, English
4,417
“P” headwords
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Initialism of polysialic acid.

Corpus desk

Index EN-psa · PSA · English

PSA · rank #15,483 · 0 variants · 20 confusables

  • FREQ-MID #15,483
  • LEN-MID 3 letters
  • VOW-1 1 vowel
  • CONFUS-HIGH 20 pairs
  • VAR-0 0 variants
  • BOOK-MID 4,417
  • PHOTO-FINISH psych

Nearest frequency peer: psych (+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 “PSA”

Lower corpus rank = more everyday usage (inverted bar length for readability)

corpus weight

What this shows Bars show where “PSA” 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).

PSA vs pt
0% similar
PSA vs PU
33% similar
PSA vs PV
33% similar

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

Key facts for PSA
PropertyValue
HeadwordPSA
LanguageEnglish
Part of speechNoun
Letters3
Frequency rank#15,483
Misspellings tracked0
Confusable pairs20
SourceWiktionary (kaikki.org)

Where “PSA” sits in English frequency

This scale runs from the tiny cluster of words that carry ordinary speech (left) to the long tail of words almost nobody reaches for (right).PSAlands 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 “psych” (#15,484), “progressively” (#15,481), “punt” (#15,485). Source: FrequencyWords open word-frequency list.

Easy to mix with look-alikes

The spelling risk for PSA is neighbouring look-alikes ("pt", "PU", …), not just typos; it is anoun. Frequency #15,483 among 4,417 “P” headwords. 7 recorded senses keep meaning in play.

We couldn't generate a plausible misspelling set for PSA, suggesting the orthography follows predictable English patterns. It also participates in 20 confusable-pair relationships, "pt", "PU", "PV", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.

Etymologically, the entry records: English initialisms. The correct English form is PSA, spelled P-S-A.

Definition

  1. 1
    Initialism of polysialic acid.
  2. 2
    Initialism of prostate-specific antigen.
  3. 3
    Initialism of pressure-sensitive adhesive.
  4. 4
    Initialism of pressure swing adsorption.
  5. 5
    Initialism of public safety announcement.
  6. 6
    Initialism of public service announcement.
  7. 7
    Initialism of purchase and sale agreement.

Recorded use

Wiktionary examples

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

  1. A high PSA reading indicates a possibility of cancer.
  2. If you are at a zoo, and a monkey climbs up high in the bars and sticks his thing through the bars, you should move away from the monkey cage. Move in an orderly fashion- don't push, don't rush, don't make it like a Who concert in Ohio. Just move back nice and slow and easy, because that monkey may be having some problems, he may have some hostility towar…

Etymology

English initialisms.

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 "PSA"?
"PSA" is spelled P-S-A.
What does "PSA" mean?
As a noun, "PSA" means: Initialism of polysialic acid.
What words are commonly confused with "PSA"?
"PSA" is commonly confused with "pt", "PU", "PV". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
What is the origin of the word "PSA"?
English initialisms. See the full etymology section above for more details.
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 "PSA", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 3 letters (nearest by frequency rank).

Rae#15,486RSS#15,496paw#15,469sal#15,498

What to do next

You've looked up "PSA". Here's where to go from here.

  • "PSA" maps to 20 confusable pairs in this vintage; the highest-scored is "pt". View pair
  • Usage frequency rank #15,483 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