Final answer:
The word 'sky' has the same ending vowel sound as 'reply', both concluding with the long 'I' sound.
Step-by-step explanation:
The word that has the same ending vowel sound as reply is sky. Both words end with the long 'I' sound, which is represented phonetically as /aɪ/. It's important to notice that while words can have different spelling patterns, they can share the same vowel sounds. For example, despite 'reply' ending with the letters 'ply' and 'sky' ending with 'ky', the pronunciation of the final syllable in both words is the same.