The five unrelated words below can be changed into five related ones according to a certain pattern. What is the pattern, and what are the new words?

1. AS
2. PAL
3. PEA
4. PIN
5. TEA

HINT:
The answer involves adding a letter to each word.

Answers:

Adding a single letter to the end of each clue word will change it into the name of  a tree:

1. AS + H = ASH
2. PAL + M = PALM
3. PEA + R = PEAR
4. PIN + E = PINE
5. TEA + K = TEAK

Credit:
Victor Barocas
LA Times Crossword
December 13, 2019