Change Pluralizer to accept and return Word objects

src/Pluralizer.php

@@ -19,39 +19,43 @@ class Pluralizer
 
     private $word;
 
-    public function __construct(string $word)
+    public function __construct(Word $word)
     {
         $this->word = $word;
     }
 
     public function pluralize()
     {
         if ($this->isUncountable()) {
-            return $this->word;
+            return new Word($this->word);
         }
 
         foreach($this->irregular as $singular => $plural) {
             if ($singular==$this->word) {
-                return $plural;
+                return new Word($plural);
             }
         }
 
-        return Inflector::pluralize($this->word);
+        $plural = Inflector::pluralize((string) $this->word);
+
+        return new Word($plural);
     }
 
     public function singularize()
     {
         if ($this->isUncountable()) {
-            return $this->word;
+            return new Word($this->word);
         }
 
         foreach($this->irregular as $singular => $plural) {
             if ($plural==$this->word) {
-                return $singular;
+                return new Word($singular);
             }
         }        
 
-        return Inflector::singularize($this->word);
+        $singular = Inflector::singularize((string) $this->word);
+
+        return new Word($singular);
     }
 
     private function isUncountable()

src/Word.php

@@ -77,12 +77,12 @@ public function syllables()
 
     public function plural()
     {
-        return (new Pluralizer($this->word))->pluralize();
+        return (new Pluralizer($this))->pluralize();
     }
 
     public function singular()
     {
-        return (new Pluralizer($this->word))->singularize();
+        return (new Pluralizer($this))->singularize();
     }
 
     public function offensive()