Same spelling, two accepted pronunciations depending which side of the Atlantic you're on.
eitherEE-ther (US) / EYE-ther (UK)
Both are correct — a genuine dialect split.
scheduleSKEJ-ool (US) / SHED-yool (UK)
The first consonant sound differs entirely.
aluminiumuh-LOO-muh-num (US: "aluminum") / al-yoo-MIN-ee-um (UK)
Different spelling too — 4 vs 5 syllables.
tomatotuh-MAY-toh (US) / tuh-MAH-toh (UK)
The classic example — literally a song lyric.
vitaminVY-tuh-min (US) / VIT-uh-min (UK)
The first vowel sound differs.
garageguh-RAHZH (US) / GA-rij (UK)
Stress falls on opposite syllables.
herbURB (US, silent H) / HURB (UK)
Americans drop the H; the British keep it.
advertisementad-ver-TYZE-ment (US) / ad-VER-tis-ment (UK)
Stress falls on a different syllable.
mobileMOH-bul (US) / MOH-byle (UK)
The ending vowel sound differs.
routeROWT or ROOT (US, both used) / ROOT (UK)
Americans use both; the British stick to "root".
leisureLEE-zher (US) / LEZH-er (UK)
The first vowel sound differs.
privacyPRY-vuh-see (US) / PRIV-uh-see (UK)
The first vowel sound differs.
addressAD-ress or uh-DRESS (US) / uh-DRESS (UK)
Americans accept both stress patterns.
fragileFRAJ-ul (US) / FRAJ-eyel (UK)
The ending vowel sound differs.
missileMISS-ul (US) / MISS-eyel (UK)
Same pattern as "fragile".
laboratoryLAB-ruh-tor-ee (US) / luh-BOR-uh-tree (UK)
Very different syllable count and stress.
clerkKLURK (US) / KLARK (UK)
The vowel sound differs entirely.
z (the letter)ZEE (US) / ZED (UK)
Not a word, but the most-argued-about letter name.
basilBAY-zul (US) / BAZ-ul (UK)
The first vowel sound differs.
dataDAY-tuh (US) / DAH-tuh (UK)
Both are heard on both sides of the Atlantic today.