diff --git a/sdk/wscript b/sdk/wscript
index e287172a..f0f7b1cb 100644
--- a/sdk/wscript
+++ b/sdk/wscript
@@ -35,7 +35,7 @@ def _generate_sdk_waf(ctx):
     for tool in sdk_waftools + shared_waftools:
         path = ctx.path.parent.find_node(tool)
         if path is None:
-            ctx.fatal("Trying to bundle non existent resource in pb-waf ({})".format(tool))
+            ctx.fatal("Trying to bundle nonexistent resource in pb-waf ({})".format(tool))
         pebble_waf_tools.append(path)
 
     # We cannot run this as a sub-wscript because we use a specific vendor-provided
diff --git a/src/fw/applib/ui/menu_layer.c b/src/fw/applib/ui/menu_layer.c
index beb42c76..979def6e 100644
--- a/src/fw/applib/ui/menu_layer.c
+++ b/src/fw/applib/ui/menu_layer.c
@@ -393,7 +393,7 @@ static void prv_menu_layer_walk_downward_from_iterator(MenuIterator *it) {
       it->cursor.sep = prv_menu_layer_get_separator_height(it->menu_layer, &it->cursor.index);
       it->cursor.y = it->cell_bottom_y; // Bottom of previous cell is y of the next cell
 
-      // Don't leave space for the seperator for the (non-existent) row after the last row.
+      // Don't leave space for the seperator for the (nonexistent) row after the last row.
       // This doesn't impact cell drawing in this loop (this condition will only trip on the last run).
       // But, other parts of the system rely on the cursor being set properly at the end of this iteration.
       if (it->cursor.index.row < num_rows_in_section - 1 || it->cursor.index.section < num_sections - 1) {
diff --git a/src/fw/comm/ble/gap_le_connect.c b/src/fw/comm/ble/gap_le_connect.c
index 8e13893e..29ac604d 100644
--- a/src/fw/comm/ble/gap_le_connect.c
+++ b/src/fw/comm/ble/gap_le_connect.c
@@ -317,7 +317,7 @@ void bt_driver_handle_le_connection_handle_update_address_and_irk(const BleAddre
     GAPLEConnection *connection = gap_le_connection_by_device(&e->device);
     if (!connection) {
       PBL_LOG(LOG_LEVEL_ERROR,
-              "Got address & IRK update for non-existent connection. "
+              "Got address & IRK update for nonexistent connection. "
               "Old addr:"BT_DEVICE_ADDRESS_FMT, BT_DEVICE_ADDRESS_XPLODE(e->device.address));
       goto unlock;
     }
diff --git a/src/fw/comm/ble/kernel_le_client/ancs/ancs.c b/src/fw/comm/ble/kernel_le_client/ancs/ancs.c
index 47b863fd..275e75d0 100644
--- a/src/fw/comm/ble/kernel_le_client/ancs/ancs.c
+++ b/src/fw/comm/ble/kernel_le_client/ancs/ancs.c
@@ -973,7 +973,7 @@ void ancs_handle_write_response(BLECharacteristic characteristic, BLEGATTError e
       prv_ancs_is_alive();
     }
 
-    // We asked for a non-existent notification, go to the next one
+    // We asked for a nonexistent notification, go to the next one
     prv_reset_and_next();
     return;
   }
diff --git a/src/fw/services/normal/data_logging/dls_endpoint.c b/src/fw/services/normal/data_logging/dls_endpoint.c
index 1083ad8b..c21a35bf 100644
--- a/src/fw/services/normal/data_logging/dls_endpoint.c
+++ b/src/fw/services/normal/data_logging/dls_endpoint.c
@@ -325,7 +325,7 @@ bool dls_endpoint_send_data(DataLoggingSession *logging_session, const uint8_t *
 static void prv_dls_endpoint_handle_ack(uint8_t session_id) {
   DataLoggingSession *session = dls_list_find_by_session_id(session_id);
   if (session == NULL) {
-    PBL_LOG_D(LOG_DOMAIN_DATA_LOGGING, LOG_LEVEL_WARNING, "Received ack for non-existent session id: %"PRIu8, session_id);
+    PBL_LOG_D(LOG_DOMAIN_DATA_LOGGING, LOG_LEVEL_WARNING, "Received ack for nonexistent session id: %"PRIu8, session_id);
     return;
   }
 
@@ -363,7 +363,7 @@ static void prv_dls_endpoint_handle_nack(uint8_t session_id) {
 
   DataLoggingSession *logging_session = dls_list_find_by_session_id(session_id);
   if (!logging_session) {
-    PBL_LOG_D(LOG_DOMAIN_DATA_LOGGING, LOG_LEVEL_WARNING, "Received nack for non-existent session id: %"PRIu8, session_id);
+    PBL_LOG_D(LOG_DOMAIN_DATA_LOGGING, LOG_LEVEL_WARNING, "Received nack for nonexistent session id: %"PRIu8, session_id);
     return;
   }
 
diff --git a/tests/fw/comm/test_gap_le_advert.c b/tests/fw/comm/test_gap_le_advert.c
index 877ae22e..22dda29c 100644
--- a/tests/fw/comm/test_gap_le_advert.c
+++ b/tests/fw/comm/test_gap_le_advert.c
@@ -827,7 +827,7 @@ void test_gap_le_advert__invalid_params(void) {
 }
 
 void test_gap_le_advert__unschedule_non_existent(void) {
-  // Unscheduling non-existent job should be fine, should not crash:
+  // Unscheduling nonexistent job should be fine, should not crash:
   gap_le_advert_unschedule((GAPLEAdvertisingJobRef)(uintptr_t) 0x1234);
 
   // Unschedule callback should not have been called:
diff --git a/tests/fw/services/blob_db/test_reminder_db.c b/tests/fw/services/blob_db/test_reminder_db.c
index 3ae3b155..41febbb0 100644
--- a/tests/fw/services/blob_db/test_reminder_db.c
+++ b/tests/fw/services/blob_db/test_reminder_db.c
@@ -283,7 +283,7 @@ void test_reminder_db__bad_item(void) {
   cl_assert(S_SUCCESS != reminder_db_insert((uint8_t *)&bad_item.common.id, UUID_SIZE, (uint8_t *)&bad_item, sizeof(bad_item)));
 }
 
-void test_reminder_db__read_nonexistant(void) {
+void test_reminder_db__read_nonexistent(void) {
   TimelineItem item = {{{0}}};
   cl_assert_equal_i(E_DOES_NOT_EXIST, reminder_db_read_item(&item, &bad_item.common.id));
 }
diff --git a/tests/fw/services/test_voice_endpoint.c b/tests/fw/services/test_voice_endpoint.c
index ce0063c7..e00f53d2 100644
--- a/tests/fw/services/test_voice_endpoint.c
+++ b/tests/fw/services/test_voice_endpoint.c
@@ -506,7 +506,7 @@ void test_voice_endpoint__handle_nlp_result(void) {
   cl_assert_equal_i(s_session_result, VoiceEndpointResultSuccess);
   cl_assert_equal_i(s_session_id, 0x2211);
 
-  // test non nexistent timestamp msg
+  // test nonexistent timestamp msg
   nlp_result[8] = 1;
   s_session_id = 0;
   voice_endpoint_protocol_msg_callback(NULL, nlp_result,  sizeof(nlp_result) - 7);