What part of speech is palpitate?

Palpitate can be categorized as a verb.

Parts of speech

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

Verb
palpitate - beat rapidly; "His heart palpitated"
palpitate - cause to throb or beat rapidly; "Her violent feelings palpitated the young woman's heart"
palpitate - shake with fast, tremulous movements; "His nostrils palpitated"