Distinction between metaphysics and ontology?

[RamistThomist]

Is metaphysics synonymous with ontology?

 

[VictorBravo]

Isn't ontology a subset of metaphysics? That is, ontology (study of essence or being) is basic to metaphysics, but so is the study of principles and epistemology.

Somewhere I remember the three basic fields of metaphysics as being ontology, theology, and science.

 

[cih1355]

Metaphysics is the study of the nature of reality so ontology would be a subset of metaphysics.