General Words:
* Conceptualization
* Generalization
* Simplification
* Idealization
* Representation
* Model
* Theory
* Concept
* Idea
* Symbolism
* Metaphor
* Summary
* Essence
* Principle
* Pattern
Words Emphasizing Distance from Reality:
* Theoretical
* Hypothetical
* Abstract (obviously!)
* Imaginary
* Ideal
* Formal
* Symbolic
* Generalized
* Non-specific
* Universal
Words Emphasizing Focus on Key Features:
* Essential
* Fundamental
* Core
* Significant
* Salient
* Central
* Relevant
Words Emphasizing Mental Process:
* Think
* Imagine
* Conceive
* Analyze
* Synthesize
* Generalize
* Deduce
* Infer
Words Related to Art & Design:
* Minimalism
* Modernism
* Avant-garde
* Conceptual art
* Non-representational
* Formalism
Words Related to Computer Science & Programming:
* Data structure
* Class
* Interface
* Algorithm
* Framework
* Design pattern
* Encapsulation
* Polymorphism
Words Related to Philosophy & Logic:
* Universal
* Necessary
* A priori
* Formal logic
* Ontology
* Metaphysics
* Epistemology
This list is not exhaustive, but it offers a wide range of words that can be used to describe different aspects of abstraction. The specific words that are most appropriate will depend on the context.