diff --git a/languagetool-language-modules/ca/src/main/resources/org/languagetool/resource/ca/entities.ent b/languagetool-language-modules/ca/src/main/resources/org/languagetool/resource/ca/entities.ent
index 91900ad62cbc..bff4105e9ec2 100644
--- a/languagetool-language-modules/ca/src/main/resources/org/languagetool/resource/ca/entities.ent
+++ b/languagetool-language-modules/ca/src/main/resources/org/languagetool/resource/ca/entities.ent
@@ -1,3 +1,4 @@
+<!ENTITY alfabet_grec "alfa|beta|delta|fi|gamma|iota|kappa|khi|ksi|lambda|mi|ni|omega|pi|psi|ro|sigma|tau|theta|zeta|eta|èpsilon|ípsilon|òmicron|[ΑαΒβΓγΔδΕεΖζΗηΘθΙιΚκΛλΜμΝνΞξΟοΠπΡρΣσςΤτΥυΦφΧχΨψΩω]" >
 <!ENTITY notes_musicals "do|re|mi|fa|sol|la|si">
 <!ENTITY math_operators "[·\*\/\^\|~¬±×÷ϐϑϒϕϰϱϴϵ϶‖′″‴⁀⁄⁒⁺⁻⁼⁽⁾₊₋₌₍₎∀∁∂∃∄∅∆∇∈∉∊∋∌∍∎∏∐∑−∓∔∕∖∗∘∙√∛∜∝∞∟∠∡∢∣∤∥∦∧∨∩∪∫∬∭∮∯∰∱∲∳∴∵∶∷∸∹∺∻∼∽∾∿≀≁≂≃≄≅≆≇≈≉≊≋≌≍≎≏≐≑≒≓≔≕≖≗≘≙≚≛≜≝≞≟≠≡≢≣≤≥≦≧≨≩≪≫≬≭≮≯≰≱≲≳≴≵≶≷≸≹≺≻≼≽≾≿⊀⊁⊂⊃⊄⊅⊆⊇⊈⊉⊊⊋⊌⊍⊎⊏⊐⊑⊒⊓⊔⊕⊖⊗⊘⊙⊚⊛⊜⊝⊞⊟⊠⊡⊢⊣⊤⊥⊦⊧⊨⊩⊪⊫⊬⊭⊮⊯⊰⊱⊲⊳⊴⊵⊶⊷⊸⊹⊺⊻⊼⊽⊾⊿⋀⋁⋂⋃⋄⋅⋆⋇⋈⋉⋊⋋⋌⋍⋎⋏⋐⋑⋒⋓⋔⋕⋖⋗⋘⋙⋚⋛⋜⋝⋞⋟⋠⋡⋢⋣⋤⋥⋦⋧⋨⋩⋪⋫⋬⋭⋮⋯⋰⋱⋲⋳⋴⋵⋶⋷⋸⋹⋺⋻⋼⋽⋾⋿→⇋]|\=|\+">
 <!-- -x\. -->
diff --git a/languagetool-language-modules/ca/src/main/resources/org/languagetool/rules/ca/grammar.xml b/languagetool-language-modules/ca/src/main/resources/org/languagetool/rules/ca/grammar.xml
index 2a5e3138f615..1bda383a441a 100644
--- a/languagetool-language-modules/ca/src/main/resources/org/languagetool/rules/ca/grammar.xml
+++ b/languagetool-language-modules/ca/src/main/resources/org/languagetool/rules/ca/grammar.xml
@@ -28261,17 +28261,22 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
         </rule>
     </category>
     <category id="CONFUSIONS" name="Confusions" type="misspelling">
-        <rulegroup id="ETA_ESTA" name="eta -> està, età..." default="temp_off">
+        <rulegroup id="ETA_ESTA" name="eta -> està, età...">
             <antipattern>
                 <token case_sensitive="yes">ETA</token>
             </antipattern>
             <antipattern>
-                <token>gora</token>
+                <token regexp="yes" inflected="yes">lletra|partícula|gora|euzkadi</token>
                 <token>eta</token>
             </antipattern>
             <antipattern>
-                <token regexp="yes" inflected="yes">lletra|partícula</token>
+                <token skip="-1">eta</token>
+                <token regexp="yes">&alfabet_grec;<exception>eta</exception></token>
+            </antipattern>
+            <antipattern>
+                <token regexp="yes" skip="-1">&alfabet_grec;<exception>eta</exception></token>
                 <token>eta</token>
+                <example>La fusió de l'eta i de l'èpsilon gregues en una sola vocal.</example>
             </antipattern>
             <rule>
                 <pattern>