Can you think of five, five-letter words that are anagrams of each other such that they all become the same word after adding the letter C - which is also the first letter of the new word?

HINTS:
1. The second letter of the new word is O
2. The third letter of the new word is R

Answers:

SPORE
PROSE
ROPES
POSER
PORES + C = CORPSE