What part of speech is counterpointed?

Counterpointed can be categorized as a verb.

Parts of speech

1. counterpointed is a verb, past participle of counterpoint (infinitive).
2. counterpointed is a verb, past simple of counterpoint (infinitive).

Verb
counterpoint - write in counterpoint; "Bach perfected the art of counterpointing"
counterpoint - to show differences when compared; be different; "the students contrast considerably in their artistic abilities"