The word delved is a verb. It is the past tense of the verb delve.
delved
You use "delved into" when you are talking about investigating or exploring a topic or subject in depth. For example, "She delved into the history of the region." "Delved with" is not a common phrase but could be used to describe someone exploring something with a tool or instrument, like "He delved with a metal detector to find buried treasure."
I delved for treasure last night.
The past tense of "delve" is "delved."
The part of speech for this particular word is a noun.
part of speech
Ignored
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.