diff --git a/core/src/units/builtin.rs b/core/src/units/builtin.rs
index 65150577..648e144a 100644
--- a/core/src/units/builtin.rs
+++ b/core/src/units/builtin.rs
@@ -129,14 +129,22 @@ const NUMBER_WORDS: &[UnitTuple] = &[
 	("five", "", "=5", ""),
 	("quintuple", "", "=5", ""),
 	("six", "", "=6", ""),
+	("sextuple", "", "=6", ""),
 	("seven", "", "=7", ""),
+	("septuple", "", "=7", ""),
 	("eight", "", "=8", ""),
+	("octuple", "", "=8", ""),
 	("nine", "", "=9", ""),
+	("nonuple", "", "=9", ""),
 	("ten", "", "=10", ""),
+	("decuple", "", "=10", ""),
 	("eleven", "", "=11", ""),
+	("undecuple", "", "=11", ""),
 	("twelve", "", "=12", ""),
+	("duodecuple", "", "=12", ""),
 	("dozen", "", "=12", ""),
 	("thirteen", "", "=13", ""),
+	("tredecuple", "", "=13", ""),
 	("bakersdozen", "", "=13", ""),
 	("fourteen", "", "=14", ""),
 	("fifteen", "", "=15", ""),