diff --git a/prompt_toolkit/completion/base.py b/prompt_toolkit/completion/base.py
index 821cc5b72..d867b632f 100644
--- a/prompt_toolkit/completion/base.py
+++ b/prompt_toolkit/completion/base.py
@@ -87,7 +87,7 @@ def __eq__(self, other: object) -> bool:
         )
 
     def __hash__(self) -> int:
-        return hash((self.text, self.start_position, self.display, self._display_meta))
+        return hash((self.text, self.start_position, self.style))
 
     @property
     def display_text(self) -> str:
diff --git a/prompt_toolkit/completion/nested.py b/prompt_toolkit/completion/nested.py
index 8b0978ca3..79f41083e 100644
--- a/prompt_toolkit/completion/nested.py
+++ b/prompt_toolkit/completion/nested.py
@@ -10,7 +10,7 @@
 __all__ = ["NestedCompleter"]
 
 # NestedDict = Mapping[str, Union['NestedDict', Set[str], None, Completer]]
-NestedDict = Mapping[str, Union[Any, Set[str], None, Completer]]
+NestedDict = Mapping[Union[str, Completion], Union[Any, Set[str], None, Completer]]
 
 
 class NestedCompleter(Completer):
@@ -86,6 +86,10 @@ def get_completions(
         if " " in text:
             first_term = text.split()[0]
             completer = self.options.get(first_term)
+            if completer is None:
+               matching =  (c for c in self.options.keys() if
+                            isinstance(c, Completion) and c.text==first_term)
+               completer =  self.options.get(next(matching, None))
 
             # If we have a sub completer, use this for the completions.
             if completer is not None:
diff --git a/prompt_toolkit/completion/word_completer.py b/prompt_toolkit/completion/word_completer.py
index 3e9b4b718..806c09b95 100644
--- a/prompt_toolkit/completion/word_completer.py
+++ b/prompt_toolkit/completion/word_completer.py
@@ -30,7 +30,7 @@ class WordCompleter(Completer):
 
     def __init__(
         self,
-        words: Union[List[str], Callable[[], List[str]]],
+        words: Union[List[Union[str, Completion]], Callable[[], Union[str, Completion]]],
         ignore_case: bool = False,
         meta_dict: Optional[Dict[str, str]] = None,
         WORD: bool = False,
@@ -78,7 +78,12 @@ def word_matches(word: str) -> bool:
             else:
                 return word.startswith(word_before_cursor)
 
+        start_position = -len(word_before_cursor)
         for a in words:
-            if word_matches(a):
+            if isinstance(a, Completion):
+                if word_matches(a.text):
+                    a.start_position = start_position
+                    yield(a)
+            elif word_matches(a):
                 display_meta = self.meta_dict.get(a, "")
-                yield Completion(a, -len(word_before_cursor), display_meta=display_meta)
+                yield Completion(a, start_position, display_meta=display_meta)