Splice the correctly-pronounced "EpochCore" from clip 2 into clip 1 — clip 1's footage stays, only that one word's audio is swapped in.
Clip 1 — keep the footage, replace one word of audio
Paste at:
s
— drag on the waveform to set
Clip 2 — source of the correct pronunciation
Copy from:
s
→
s
— drag a range on the waveform
Ready.
Tips
Click‑drag on clip 2's waveform to mark the word "EpochCore". Click on clip 1's waveform to mark where the word should land (the paste duration matches the source). Preview a few times to nail the timing, then Export.