Puzzle ZZQO

Each of these words can be split in half, and two letters can be placed in the middle to create a new six-letter word.

The four added pairs of letters, in order, spell an 8-letter word. What is that word?
lend
liar
pale
coin

As an example, DOOR can be split into DO + OR. CT can then be placed in the middle to create: DO + CT + OR = DOCTOR.

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