The husk and stray are counted as sub-variants of existing mobs as opposed to entirely new mobs, hence why you are unable to simply type /summon Stray or /summon Husk. There was supposed to be spawn eggs for them, but it seems they were removed either intentionally or by accident in the final release.
Axiomatic method, in logic, a procedure by which an entire system (e.g., a science) is generated in accordance with specified rules by logical deduction from certain basic propositions (axioms or postulates), which in turn are constructed from a few terms taken as primitive.
Axios is the Greek word from which we get the English word axiom or axiomatic.. At the mouth of the river Vardar (referred to as Axios by Greeks) it commanded the gateway to one of the most important routes from the eastern Mediterranean and North Africa to the Balkans and, via the Danube, to Central Europe.