STM vs sump, What's the Difference?

Which to use

“STM” and “sump” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#38,181
“STM” frequency rank: #41,400
“sump” frequency rank: 79581
confusion score

Side-by-Side Comparison

Feature	STM	sump
Definition	Initialism of scanning tunneling microscope.	A hollow or pit into which liquid drains, such as a cesspool, cesspit or sink.

Where the spellings diverge

Shared letters are muted; the letters that actually set STM and sump apart are highlighted. They share 2 letters in sequence, which is exactly why the eye skips the difference.

3 ch

STM

4 ch

sump

Spelling & Dictionary Insight

STM and sump are indexed as a confusable English pair. We have no recorded pronunciation or part of speech for both members, so the spelling overlap is what we can show you: they differ by 1 letter(s) in length. Our composite confusion score for this pair is 79581, derived from the frequency rank of both members and their visual similarity.

STM is recorded at frequency rank #38,181, classified as anoun. sump is at rank #41,400, tagged as anoun, pronounced /sʌmp/.

Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.

With a confusion score of 79581, this pair ranks #21,730 of 530,003 scored English confusable pairs - among the most confusable pairs.

Orthographic DNA of STM vs sump

Shared letters: ms. Private to "STM": t. Private to "sump": pu.

"STM" · 3 letters · shape CCC · "sump" · 4 letters · shape CVCC

Known mistypes of this pair

sump ← smup · ssump · summp · sumpp · supm · usmp

Frequency comparison

STM#38,181

sump#41,400

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

Can "STM" and "sump" be used interchangeably?

No. They differ by 1 letter(s) in length, but the dictionary glosses above give them different meanings, so swapping one for the other changes what the sentence says.

Which is more common, "STM" or "sump"?

"STM" is the more common of the two: it sits at frequency rank #38,181 in our English list, against #41,400 for "sump". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Remembering STM vs sump

The fastest way to pick the right one every time.

Read both glosses above and match the meaning you intend, only context separates this pair.
See each word in full, definition, IPA, etymology and its other confusables. Full “STM” entry
Browse more pairs most likely to be confused. Most confusable