What part of speech is protract?

Protract can be categorized as a verb.

Parts of speech

1. protract is a verb, present, 1st person singular of protract (infinitive).
2. protract is a verb (infinitive).

Verb
protract - lengthen in time; cause to be or last longer; "We prolonged our stay"; "She extended her visit by another day"; "The meeting was drawn out until midnight"
Noun
protract - Tedious continuance or delay.