Yes — "one" is one of the earliest sight words, taught alongside basic counting. Its pronunciation ("wun") has almost no connection to how it's spelled, making it a pure sight word from a child's very first lessons.
I only have one cookie left.
Nothing about the letters "o-n-e" suggests the sound "wun" — there's no phonics rule that would lead a child there through sounding out. This complete mismatch between spelling and pronunciation is why "one" is memorized as a whole shape from the start, well before a child learns any letter-sound rules that could help.
Since "one" is also a number word, practice it alongside counting — "one, two, three" — so the word gets reinforced in a context kids already know well.
Word Wizard teaches "one" with Flash Cards, Listen & Pick, Spell It, and Write It — four game modes that turn repetition into play.
See "one" with its picture, syllables, and example sentence — with native audio.
Hear "one" spoken aloud and pick it out from similar-looking words.
Build "one" letter by letter from shuffled tiles.
Word Wizard turns sight word practice into a game — Flash Cards, Listen & Pick, Spell It and Write It, from Pre-K through Grade 5.