diff --git a/codespell_lib/data/dictionary.txt b/codespell_lib/data/dictionary.txt
index 4df8f1c..9171735 100644
--- a/codespell_lib/data/dictionary.txt
+++ b/codespell_lib/data/dictionary.txt
@@ -25870,6 +25870,9 @@
 Sionist->Zionist
 Sionists->Zionists
 siply->simply
+sircle->circle
+sircles->circles
+sircular->circular
 sirect->direct
 sirected->directed
 sirecting->directing
@@ -27654,6 +27657,12 @@
 sychronmode->synchronmode
 sychronous->synchronous
 sychronously->synchronously
+sycle->cycle
+sycled->cycled
+sycles->cycles
+syclic->cyclic, psychic,
+syclical->cyclical, physical,
+sycling->cycling
 sycn->sync
 sycology->psychology
 sycronise->synchronise
@@ -27674,6 +27683,8 @@
 syle->style
 syles->styles
 sylibol->syllable
+sylinder->cylinder
+sylinders->cylinders
 syllabills->syllabus, syllabification,
 sylog->syslog
 symantics->semantics