diff --git a/lib/puppet/pops/issues.rb b/lib/puppet/pops/issues.rb
index e7b3c467e89..24bd5666be9 100644
--- a/lib/puppet/pops/issues.rb
+++ b/lib/puppet/pops/issues.rb
@@ -495,6 +495,10 @@ def self.hard_issue(issue_code, *args, &block)
     "Use of reserved word: #{word}, must be quoted if intended to be a String value"
   end
 
+  RESERVED_TYPE_NAME = hard_issue :RESERVED_TYPE_NAME, :name do
+    "The name: '#{name}' is already defined by Puppet and can not be used as the name of #{label.a_an(semantic)}."
+  end
+
   UNMATCHED_SELECTOR = hard_issue :UNMATCHED_SELECTOR, :param_value do
     "No matching entry for selector parameter with value '#{param_value}'"
   end
diff --git a/lib/puppet/pops/validation/checker4_0.rb b/lib/puppet/pops/validation/checker4_0.rb
index 53f696a6bb9..4baff2ebcf4 100644
--- a/lib/puppet/pops/validation/checker4_0.rb
+++ b/lib/puppet/pops/validation/checker4_0.rb
@@ -245,12 +245,39 @@ def check_NamedAccessExpression(o)
     end
   end
 
+  RESERVED_TYPE_NAMES = {
+    'type' => true,
+    'any' => true,
+    'unit' => true,
+    'scalar' => true,
+    'boolean' => true,
+    'numeric' => true,
+    'integer' => true,
+    'float' => true,
+    'collection' => true,
+    'array' => true,
+    'hash' => true,
+    'tuple' => true,
+    'struct' => true,
+    'variant' => true,
+    'optional' => true,
+    'enum' => true,
+    'regexp' => true,
+    'pattern' => true,
+    'runtime' => true,
+  }
+
   # for 'class', 'define', and function
   def check_NamedDefinition(o)
     top(o.eContainer, o)
     if o.name !~ Puppet::Pops::Patterns::CLASSREF
       acceptor.accept(Issues::ILLEGAL_DEFINITION_NAME, o, {:name=>o.name})
     end
+
+    if RESERVED_TYPE_NAMES[o.name()]
+      acceptor.accept(Issues::RESERVED_TYPE_NAME, o, {:name => o.name})
+    end
+
     if violator = ends_with_idem(o.body)
       acceptor.accept(Issues::IDEM_NOT_ALLOWED_LAST, violator, {:container => o})
     end
diff --git a/spec/unit/pops/validator/validator_spec.rb b/spec/unit/pops/validator/validator_spec.rb
index ab4f3ebc744..2dcb9ed3f8b 100644
--- a/spec/unit/pops/validator/validator_spec.rb
+++ b/spec/unit/pops/validator/validator_spec.rb
@@ -120,6 +120,41 @@ def validate(model)
     end
   end
 
+  context 'for reserved type names' do
+    [# type/Type, is a reserved name but results in syntax error because it is a keyword in lower case form
+    'any',
+    'unit',
+    'scalar',
+    'boolean',
+    'numeric',
+    'integer',
+    'float',
+    'collection',
+    'array',
+    'hash',
+    'tuple',
+    'struct',
+    'variant',
+    'optional',
+    'enum',
+    'regexp',
+    'pattern',
+    'runtime',
+    ].each do |name|
+
+      it "produces an error for 'class #{name}'" do
+        source = "class #{name} {}"
+        expect(validate(parse(source))).to have_issue(Puppet::Pops::Issues::RESERVED_TYPE_NAME)
+      end
+
+      it "produces an error for 'define #{name}'" do
+        source = "define #{name} {}"
+        expect(validate(parse(source))).to have_issue(Puppet::Pops::Issues::RESERVED_TYPE_NAME)
+      end
+    end
+
+  end
+
   def parse(source)
     Puppet::Pops::Parser::Parser.new().parse_string(source)
   end