atom

The filled squares are the 2 vowels — 2 of 4 letters. In the size-ranked list, atom sits in the everyday tier.

Letters

43,903 words share the length

Syllables

2stress on the first

Anagrams

1moat

One letter away

1atop

• noun(physics and chemistry) the smallest component of an element having the chemical properties of the element
• noun(nontechnical usage) a tiny piece of anything

The CMU Pronouncing Dictionary reads it as ae1 t ah0 m — 2 syllables, the stress on syllable 1.

2 words share everything from the last stressed vowel on — that is what counts as a rhyme here.

• datum
• stratum

One other word use exactly these letters: moat.

The whole set on one page.

• atop

Same length, one position changed. <1% of the 3,903 words this long are a neighbour.

• 4 letter words3,903
• Starts A10,456
• Starts AT361
• Ends M
• 4 letters starting A

Tier: everyday. The tiers come from the English Speller Database and rank by list size, not by how often a word is used — see where the words come from.