Peer means an equal, or to look closely; pier is a platform reaching out over water. Memory hook: a pier stands in the sea, while a peer is someone you see eye to eye with.
The core difference
A peer is an equal (or, as a verb, to look closely), while a pier is a structure built out over water or a supporting column.
- peer — someone of the same age, rank or status, or to look closely: She peered into the dark room.
- pier — a raised platform extending out over water: They walked along the pier and watched the fishermen.
- pier also means a supporting column for a bridge or arch: Engineers inspected the concrete piers under the bridge.
How to tell them apart
If the sentence is about people, equality or looking hard at something, use peer. If it is about the seaside, boats, or a column holding something up, use pier.
A trick: peer contains a double ee, like two eyes looking closely, while pier has ie, and a pier is what you walk out on over water.
Where the mix-up shows up
Because they are homophones, the slip tends to appear in phrases like peer pressure, which is never spelled with pier, or in writing about the seaside where peer is used by mistake.
