diff --git a/bugbug/bug_features.py b/bugbug/bug_features.py
index 5680f3b0..2673b202 100644
--- a/bugbug/bug_features.py
+++ b/bugbug/bug_features.py
@@ -182,10 +182,15 @@ def cleanup_fileref(text):
 
 
 def cleanup_synonyms(text):
-    synonyms = [('safemode', ['safe mode', 'safemode'])]
+    synonyms = [
+        ('safemode', ['safemode', 'safe mode']),
+        ('str', ['str', 'steps to reproduce', 'repro steps']),
+        ('uaf', ['uaf', 'use after free', 'use-after-free']),
+        ('asan', ['asan', 'address sanitizer']),
+    ]
 
     for synonym_group, synonym_list in synonyms:
-        text = re.sub('|'.join(synonym_list), synonym_group, text)
+        text = re.sub('|'.join(synonym_list), synonym_group, text, flags=re.IGNORECASE)
 
     return text
 
diff --git a/tests/test_cleanup_functions.py b/tests/test_cleanup_functions.py
index 27cf4c21..6e683d8e 100644
--- a/tests/test_cleanup_functions.py
+++ b/tests/test_cleanup_functions.py
@@ -28,6 +28,10 @@ def test_cleanup_fileref():
 def test_cleanup_synonyms():
     tests = [
         ('I was in safemode, but the problem occurred in safe mode too', 'I was in safemode, but the problem occurred in safemode too'),
+        ('SAFE MODE or SAFEMODE?', 'safemode or safemode?'),
+        ('are there str? steps to reproduce? repro steps?', 'are there str? str? str?'),
+        ('this is a use-after-free, also called uaf, also called use after free', 'this is a uaf, also called uaf, also called uaf'),
+        ('found via address sanitizer or asan', 'found via asan or asan'),
     ]
     for orig_text, cleaned_text in tests:
         assert bug_features.cleanup_synonyms(orig_text) == cleaned_text