What part of speech is explicate?

Explicate can be categorized as a verb.

Parts of speech

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

Verb
explicate - elaborate, as of theories and hypotheses; "Could you develop the ideas in your thesis"
explicate - make plain and comprehensible; "He explained the laws of physics to his students"