How do you find properties associated with an entity

I am hoping to get the associated properties/fields to an entity through the API. The EntityType Reference page has the individual entities listed, and when you select an entity (for example: account) there is a list of associated properties; these properties are what I hope to be able to access within the API. I am currently able to access entities through the /EntityDefinitions endpoint. Is there an endpoint that shows all of the associated properties to that endpoint? For instance, if you could sort by SchemaName or id and get associated properties?