diff --git a/gtsam/discrete/DecisionTreeFactor.h b/gtsam/discrete/DecisionTreeFactor.h
index e59552007..95054bcdb 100644
--- a/gtsam/discrete/DecisionTreeFactor.h
+++ b/gtsam/discrete/DecisionTreeFactor.h
@@ -104,7 +104,7 @@ namespace gtsam {
       return ADT::operator()(values);
     }
 
-    /// Evaluate probability density, sugar.
+    /// Evaluate probability distribution, sugar.
     double operator()(const DiscreteValues& values) const override {
       return ADT::operator()(values);
     }
diff --git a/gtsam/discrete/DiscreteBayesTree.h b/gtsam/discrete/DiscreteBayesTree.h
index f65508a1a..b0c3dfb7d 100644
--- a/gtsam/discrete/DiscreteBayesTree.h
+++ b/gtsam/discrete/DiscreteBayesTree.h
@@ -63,7 +63,7 @@ class GTSAM_EXPORT DiscreteBayesTreeClique
 
 /* ************************************************************************* */
 /**
- * @brief A Bayes tree representing a Discrete density.
+ * @brief A Bayes tree representing a Discrete distribution.
  * @ingroup discrete
  */
 class GTSAM_EXPORT DiscreteBayesTree
diff --git a/gtsam/discrete/DiscreteConditional.cpp b/gtsam/discrete/DiscreteConditional.cpp
index c40573ee8..5abc094fb 100644
--- a/gtsam/discrete/DiscreteConditional.cpp
+++ b/gtsam/discrete/DiscreteConditional.cpp
@@ -266,7 +266,7 @@ void DiscreteConditional::sampleInPlace(DiscreteValues* values) const {
 size_t DiscreteConditional::sample(const DiscreteValues& parentsValues) const {
   static mt19937 rng(2);  // random number generator
 
-  // Get the correct conditional density
+  // Get the correct conditional distribution
   ADT pFS = choose(parentsValues, true);  // P(F|S=parentsValues)
 
   // TODO(Duy): only works for one key now, seems horribly slow this way
diff --git a/gtsam/discrete/DiscreteMarginals.h b/gtsam/discrete/DiscreteMarginals.h
index 7bb2cc6f8..b97e60805 100644
--- a/gtsam/discrete/DiscreteMarginals.h
+++ b/gtsam/discrete/DiscreteMarginals.h
@@ -41,7 +41,7 @@ class DiscreteMarginals {
   DiscreteMarginals() {}
 
   /** Construct a marginals class.
-   * @param graph The factor graph defining the full joint density on all variables.
+   * @param graph The factor graph defining the full joint distribution on all variables.
    */
   DiscreteMarginals(const DiscreteFactorGraph& graph) {
     bayesTree_ = graph.eliminateMultifrontal();
diff --git a/gtsam/discrete/Signature.h b/gtsam/discrete/Signature.h
index 963843ab2..df175bc10 100644
--- a/gtsam/discrete/Signature.h
+++ b/gtsam/discrete/Signature.h
@@ -25,7 +25,7 @@
 namespace gtsam {
 
   /**
-   * Signature for a discrete conditional density, used to construct conditionals.
+   * Signature for a discrete conditional distribution, used to construct conditionals.
    *
    * The format is (Key % string) for nodes with no parents,
    * and (Key | Key, Key = string) for nodes with parents.