ace and one share a recorded sense, so the question is not what they mean but which one fits. ace means “the smallest whole number or a numeral representing this number”. one means “used of a single unit or thing; not two or more”. one is the more common of the two in everyday English.
/ˈeɪs/
1.n.the smallest whole number or a numeral representing this number
“he has the one but will need a two and three to go with it”
2.n.one of four playing cards in a deck having a single pip on its face
3.n.someone who is dazzlingly skilled in any field
/ˈwʌn/
1.adj.used of a single unit or thing; not two or more
“`ane' is Scottish”
2.adj.having the indivisible character of a unit
“a unitary action”
3.adj.of the same kind or quality
“two animals of one species”
| ace | one | |
|---|---|---|
| Pronunciation | /ˈeɪs/ | /ˈwʌn/ |
| Said | ays | wuhn |
| Syllables | 1 | 1 |
| Letters | 3 | 3 |
| Parts of speech | noun, verb, adjective | adjective, noun |
| Senses | 11 | 9 |
| How common | Common | Core |
| Synonyms | one, 1, I | 1, i, ane |