diff --git a/nomen/utils.py b/nomen/utils.py
index f4b49bc..c30f736 100644
--- a/nomen/utils.py
+++ b/nomen/utils.py
@@ -89,7 +89,7 @@ def compile_keyword(keyword, regex):
         keyword = re.escape(keyword)
 
     try:
-        reg = re.compile(rf"(?i)\b{keyword}\b")
+        reg = re.compile(rf"(?i)(\b|_){keyword}(\b|_)")
         regex_cache[(keyword, regex)] = reg
         return reg
     except re._re2.Error: