diff --git a/src/backend/access/index/indexam.c b/src/backend/access/index/indexam.c
index 85d844f4b6..bbd499abcf 100644
--- a/src/backend/access/index/indexam.c
+++ b/src/backend/access/index/indexam.c
@@ -142,7 +142,7 @@ index_open(Oid relationId, LOCKMODE lockmode)
 }
 
 /* ----------------
- *		try_index_open - open a index relation by relation OID
+ *		try_index_open - open an index relation by relation OID
  *
  *		Same as index_open, except return NULL instead of failing
  *		if the relation does not exist.
diff --git a/src/backend/commands/explain.c b/src/backend/commands/explain.c
index 3d590a6b9f..843472e6dd 100644
--- a/src/backend/commands/explain.c
+++ b/src/backend/commands/explain.c
@@ -2395,7 +2395,7 @@ show_sort_keys(SortState *sortstate, List *ancestors, ExplainState *es)
 }
 
 /*
- * Show the sort keys for a IncrementalSort node.
+ * Show the sort keys for an IncrementalSort node.
  */
 static void
 show_incremental_sort_keys(IncrementalSortState *incrsortstate,
diff --git a/src/backend/replication/logical/worker.c b/src/backend/replication/logical/worker.c
index 911835c5cb..9b598caf3c 100644
--- a/src/backend/replication/logical/worker.c
+++ b/src/backend/replication/logical/worker.c
@@ -332,7 +332,7 @@ static TransactionId stream_xid = InvalidTransactionId;
  */
 static uint32 parallel_stream_nchanges = 0;
 
-/* Are we initializing a apply worker? */
+/* Are we initializing an apply worker? */
 bool		InitializingApplyWorker = false;
 
 /*
diff --git a/src/backend/utils/activity/wait_event.c b/src/backend/utils/activity/wait_event.c
index ec14119a71..e7dd489cbd 100644
--- a/src/backend/utils/activity/wait_event.c
+++ b/src/backend/utils/activity/wait_event.c
@@ -49,7 +49,7 @@ uint32	   *my_wait_event_info = &local_my_wait_event_info;
  * Hash tables for storing custom wait event ids and their names in
  * shared memory.
  *
- * WaitEventExtensionHashById is used to find the name from a event id.
+ * WaitEventExtensionHashById is used to find the name from an event id.
  * Any backend can search it to find custom wait events.
  *
  * WaitEventExtensionHashByName is used to find the event ID from a name.
diff --git a/src/test/modules/test_ginpostinglist/expected/test_ginpostinglist.out b/src/test/modules/test_ginpostinglist/expected/test_ginpostinglist.out
index 4d0beaecea..c3f40ab71d 100644
--- a/src/test/modules/test_ginpostinglist/expected/test_ginpostinglist.out
+++ b/src/test/modules/test_ginpostinglist/expected/test_ginpostinglist.out
@@ -1,7 +1,7 @@
 CREATE EXTENSION test_ginpostinglist;
 --
 -- All the logic is in the test_ginpostinglist() function. It will throw
--- a error if something fails.
+-- an error if something fails.
 --
 SELECT test_ginpostinglist();
 NOTICE:  testing with (0, 1), (0, 2), max 14 bytes
diff --git a/src/test/modules/test_ginpostinglist/sql/test_ginpostinglist.sql b/src/test/modules/test_ginpostinglist/sql/test_ginpostinglist.sql
index b8cab7acce..107baf8f27 100644
--- a/src/test/modules/test_ginpostinglist/sql/test_ginpostinglist.sql
+++ b/src/test/modules/test_ginpostinglist/sql/test_ginpostinglist.sql
@@ -2,6 +2,6 @@ CREATE EXTENSION test_ginpostinglist;
 
 --
 -- All the logic is in the test_ginpostinglist() function. It will throw
--- a error if something fails.
+-- an error if something fails.
 --
 SELECT test_ginpostinglist();