What part of speech is interchangeableness?

Interchangeableness can be categorized as a noun.

Parts of speech

• 1. interchangeableness is a noun, singular of interchangeablenesses.

Inflections

Noun

• Singular

  Plural
• interchangeableness 

  interchangeablenesses 

• Singular: interchangeableness 
• Plural: interchangeablenesses 

What does interchangeableness mean?