What part of speech is rustproofs?

Rustproofs can be categorized as a verb.

Parts of speech

• 1. rustproofs is a verb, present, 3rd person singular of rustproof (infinitive).

Inflections

Verb

• Infinitive

  Present

  Simple Past

  Past Participle

  Gerund
• (to) rustproof 

  rustproof  / rustproofs 

  rustproofed 

  rustproofed 

  rustproofing 

• Infinitive: (to) rustproof 
• Present: rustproof  / rustproofs 
• Simple Past: rustproofed 
• Past Participle: (have) rustproofed 
• Gerund: rustproofing 

What does rustproofs mean?