SWAP MEET

Swap one word from List I with one word in List II so that the two lists have a similar, though different property. Which two words must be swapped and what is the property?

LIST I
RODE
EARTH
HEART
LUMP

LIST II
OAR
TRIPLE
THOUGH
DYE

Answers:

The words that must be swapped are HEART and OAR.

The common property is that each word can have a letter from one end of the word added to the other end and a new word will be formed. List I words must have the last letter added to the beginning of the word, while List II words must have the first letter added to the end of the word:

LIST I 
ERODE
HEARTH
ROAR
PLUMP

LIST II 
HEARTH

TRIPLET
THOUGHT
DYED