PER - For each.
PIE - A type of pastry that consists of an outer crust and a filling.
RIM - An edge around something, especially when circular.
RIP - A tear (in paper, etc.).
IMP - To plant or engraft.
REP - Short form of reputation.
ERR - To make a mistake.
IRE - Iron.
REM - Rapid eye movement, a sleep state.
PIER - A raised platform built from the shore out over water, supported on piles; used to secure, or provide access to shipping; a jetty.
RIPE - Ready for reaping or gathering; having attained perfection; mature; -- said of fruits, seeds, etc.; as, ripe grain.
PRIM - To make affectedly precise or proper.
MIRE - Deep mud; moist, spongy earth.
PERM - A permanent.
PRIME - First in importance, degree, or rank.
RIPER - Comparative form of ripe: more ripe.
PRIMER - An elementary textbook introducing a topic, or teaching basic concepts.